To see the other types of publications on this topic, follow the link: Wavelength division multiplexing Computer networks Optical communications.
Dissertations / Theses on the topic 'Wavelength division multiplexing Computer networks Optical communications'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Wavelength division multiplexing Computer networks Optical communications.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Saad, Mohamed Elsayed Mostafa Luo Zhi-Quan. "Design of optical networks: performance bounds, complexity and algorithms /." *McMaster only, 2004.
Find full text
2
He, Jingyi. "Routing and channel assignment in optical and wireless networks /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20HE.
Full text
3
Al-Fuqaha, Ala Isam Chaudhry Ghulam M. "Routing and wavelength assignment in all-optical DWDM networks with sparse wavelength conversion capabilities." Diss., UMK access, 2004.
Find full textAbstract:
Thesis (Ph. D.)--School of Computing and Engineering. University of Missouri--Kansas City, 2004.<br>"A dissertation in engineering and computer networking." Advisor: Ghulam Chaudhry. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Feb. 22, 2006. Includes bibliographical references (leaves 135-157). Online version of the print edition.
4
Agrawal, Gaurav Medhi Deepankar. "Lightpath topology configuration for wavelength-routed IP/MPLS networks in a multi-layered environment integrated models, algorithms, and analysis /." Diss., UMK access, 2007.
Find full textAbstract:
Thesis (Ph. D.)--School of Computing and Engineering. University of Missouri--Kansas City, 2007.<br>"A dissertation in computer networking and telecommunication networking." Advisor: Deep Medhi. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Jan. 24, 2008. Includes bibliographical references (leaves 130-138). Online version of the print edition.
5
Sharma, Ameeth. "Performance comparison of two dynamic shared-path protection algorithms for WDM optical mesh networks." Diss., Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01262009-141918/.
Full text
6
Liu, David Q. "Differentiated service support in optical burst switching WDM networks." Columbus, Ohio : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1063310775.
Full textAbstract:
Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xxvii, 229 p. : ill. Advisor: Ming-Tsan Mike Liu, Department of Computer and Information Science. Includes bibliographical references (p. 219-229).
7
Ahmadvand, Nima. "Wavelength division multiplexing cross connect networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30066.pdf.
Full text
8
Qiao, Jie. "Dense wavelength division multiplexing (DWDM) for optical networks." Access restricted to users with UT Austin EID, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3035169.
Full text
9
Deng, Xuegong. "High performance wavelength-division multiplexing schemes for optical networks." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3031039.
Full text
10
Chu, Xiaowen. "RWA and wavelength conversion in wavelength-routed all-optical WDM networks /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?COMP%202003%20CHU.
Full textAbstract:
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.<br>Includes bibliographical references (leaves 127-134). Also available in electronic version. Access restricted to campus users.
11
Castleford, David. "Optical crosstalk in WDM Fibre-Radio networks /." Connect to thesis, 2002. http://eprints.unimelb.edu.au/archive/00000405.
Full text
12
Luo, Xubin. "Wavelength Division Multiplexing Optical Networks for Supporting Grid Computing." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1221753325.
Full text
13
Dods, Sarah D. "Homodyne crosstalk in wavelength-division multiplexed ring and cus networks /." Connect to thesis, 2000. http://eprints.unimelb.edu.au/archive/00000597.
Full text
14
Abujnah, Nabeil Abduljallil Abubaker. "Numerical modelling of optical micro-cavity ring resonators for WDM networks." Thesis, University of South Wales, 2011. https://pure.southwales.ac.uk/en/studentthesis/numerical-modelling-of-optical-microcavity-ring-resonators-for-wdm-networks(ac752a5d-5bf1-4ee6-8345-c20fe8aea769).html.
Full textAbstract:
Augmenting the level of integration for a lower cost and enhancing the performance of the optical devices have turned out to be the focus of many research studies in the last few decades. Many distinct approaches have been proposed in a significant number of researches in order to meet these demands. Optical planar waveguides stand as one of vital employed approach in many studies. Although, their low propagation loss, and low dispersion, they suffers from high power losses at sharp bends. For this reason, large radius of curvature is required in order to achieve high efficiency and compromise the high level of integration. For the purpose of this research, in this thesis different ways to improve the performance of optical microcavity ring resonators (MRRs) have been thoroughly investigated and new configurations have been proposed. The Multiresolution Time Domain (MRTD) technique was further developed and employed throughout this thesis as the main numerical modelling technique. The MRTD algorithm is used as a computer code. This code is developed and enhanced using self built Compaq Visual Fortran code. Creating the structure and Post-processing the obtained data is carried out using self built MATLAB code. The truncating layers used to surround the computational domain were Uniaxial Perfectly Matched Layers (UPML). The accuracy of this approach is demonstrated via the excellent agreement between the results obtained in literature using FDTD method and the results of MRTD. This thesis has focused on showing numerical efficiency of MRTD where the mesh size allowed or the total number of computed points is about half that used with FDTD. Furthermore, the MRR geometry parameters such as coupling gap size, microring radius of curvature, and waveguide width have been thoroughly studied in order to predict and optimise the device performance. This thesis also presents the model analysis results of a parallel-cascaded double-microcavity ring resonator (PDMRR). The analysis is mainly focus on the extraction of the resonant modes where the effect of different parameters of the structure on transmitted and coupled power is investigated. Also, accurate analysis of 2D coupled microcavity ring resonator based on slotted waveguides (SMRR) has been thoroughly carried out for the purpose of designing optical waveguide delay lines based on slotted ring resonator (SCROW). The SCROW presented in this thesis are newly designed to function according to the variation of the resonance coupling efficiency of a slotted ring resonators embedded between two parallel waveguides. The slot of the structures is filled with SiO2 and Air that cause the coupling efficiency to vary which in turn control both the group velocity and delay time of SCROW structures results from the changing the properties of the bent slotted waveguide modes which strongly depends on the slot’s position. Significant improvements on the quality factor and greater delay time have been achieved by introducing sub-wavelength-low-index slot into conventional waveguide.
15
Akanbi, Oladeji Bamidele. "Bi-directional Dense Wavelength Division Multiplexed Systems for Broadband Access Networks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13964.
Full textAbstract:
Dense wavelength division multiplexing (DWDM) is becoming the technology of choice for meeting the increasing bandwidth demands in optical networks. DWDM has been used to increase the capacity of long-haul optical transport systems. Efforts are being made to move DWDM into the broadband access network serving residential and business subscribers.
First, a new centralized DWDM PON scheme is demonstrated for bi-directional upstream and downstream transmissions. The proposed DWDM PON scheme is implemented using optical carrier suppression and separation (OCSS) technology to generate a wavelength pair from a single laser source at the central office. This method enables the co-location of both upstream and downstream DWDM transmitters in the central office. In addition, the complexity, cost, and maintenance of the optical network unit are reduced by enabling wavelength independent operation.
Second, a new multistage architecture is proposed for the delivery of information to groups of subscribers located at different distances from the central office. A 25 GHz DWDM comb is generated using OCSS technology, and error-free transmission of four 10 Gbps channels is demonstrated.
Finally, a new wide area access network with bi-directional DWDM amplification using semiconductor optical amplifiers (SOAs) is demonstrated. The detrimental effect of SOA
crosstalk resulting from cross gain modulation can be suppressed using a constant intensity
modulation format such as differential phase shift keying (DPSK). The feasibiity of
bi-directional DPSK transmission of 16
interleaved DWDM channels using an in-line SOA has been studied experimentally. In addition, the reduction of bi-directional SOA reflections has been realized by optimizing the SOA bias current and facet reflectivities.
16
Li, Ji. "Design and analysis of survivable WDM mesh networks." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38574846.
Full text
17
Li, Guangming. "Novel resource allocation schemes in optical burst switching networks." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37051040.
Full text
18
Li, Guangming, and 李光明. "Novel resource allocation schemes in optical burst switching networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37051040.
Full text
19
Gamatham, Romeo Reginald Gunther. "Nonlinear effects with a focus on cross phase modulation and its impact on wavelength division multiplexing optical fibre networks." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/6302.
Full textAbstract:
The demand for faster data transmission is ever increasing. Wavelength division multiplexing (WDM) presents as a viable solution to increase the data transmission rate significantly. WDM systems are based on the ability to transmit multiple wavelengths simultaneously down the fibre. Unlike time division multiplexing (TDM) systems, WDM systems do not increase the data transfer by increasing the transmission rate of a single channel. In WDM systems the data rate per channel remains the same, only multiple channels carry data across the link. Dense wavelength division multiplexing (DWDM) promises even more wavelengths packed together in the same fibre. This multiplication of channels increases the bandwidth capacity rapidly. Networks are looking into making use of technology that will ensure no electronic signal regeneration at any point within the DWDM network. Examples are; reconfigurable optical add/drop multiplexers (ROADM) and optical cross connect (OXC) units. These components essentially enable network operators to split, combine and multiplex optical signals carried by optical fibre. WDM allows network operators to increase the capacity of existing networks without expensive re-cabling. This provides networks with the flexibility to be upgraded to larger bandwidths and for reconfiguration of network services. Further, WDM technology opens up an opportunity of marketing flexibility to network operators, where operators not only have the option to rent out cables and fibres but wavelengths as well. Cross phase modulation (XPM) poses a problem to WDM networks. The refractive index experienced by a neighbouring optical signal, not only depends on the signal’s intensity but on the intensity of the co-propagating signal as well. This effect leads to a phase change and is known as XPM. This work investigates the characteristics of XPM. It is shown that, in a two channel WDM network, a probe signal’s SOP can be steered by controlling a high intensity pump signal’s SOP. This effect could be applied to make a wavelength converter. Experimental results show that the degree of polarization (DOP) of a probe signal degrades according to a mathematical model found in literature. The pump and probe signals are shown to experience maximum interaction, for orthogonal probe-pump SOP vector orientations. This may be problematic to polarization mode dispersion compensators. Additionally, experimental results point out that the SOP of a probe signal is much more active in the presence of a high intensity pump, as compared to the single signal transmission scenario.
20
Li, Ji, and 李季. "Design and analysis of survivable WDM mesh networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38574846.
Full text
21
Huang, Hong. "Hybrid and resilient WDM mesh optical networks." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15751.
Full text
22
Abou-Galala, Feras Moustafa. "True-time all optical performance monitoring by means of optical correlation." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1180549555.
Full text
23
Cheng, Kin On. "A multi-stage optical switch with output buffer using WDM for delay lines sharing /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20CHENG.
Full textAbstract:
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.<br>Includes bibliographical references (leaves 77-79). Also available in electronic version. Access restricted to campus users.
24
Wang, Dongxue Michael. "Optoelectronic device simulation optical modeling for semiconductor optical amplifiers and solid state lighting /." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-03292006-132611/.
Full textAbstract:
Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2006.<br>Buck, John, Committee Co-Chair ; Ferguson, Ian, Committee Chair ; Krishnamurthy,Vikram, Committee Member ; Chang, Gee-Kung, Committee Member ; Callen, W. Russell Jr., Committee Member ; Summers, Christopher, Committee Member.
25
Kanj, Matthieu. "Intelligent supervision of flexible optical networks." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S138/document.
Full textAbstract:
Les réseaux optiques dynamiques et flexibles font partie des scénarios d'évolution des réseaux de transport optique. Ceux-ci formeront la base de la nouvelle génération des réseaux optiques de demain et permettront le déploiement efficace des services tel que le Cloud Computing. Cette évolution est destinée à apporter flexibilité et automatisation à la couche optique, mais s'accompagne d'une complexité supplémentaire, notamment au niveau de la gestion et de la commande de cette toute nouvelle génération de réseau. Jusqu'à récemment, les protocoles de routage et de signalisation normalisés ont pris en compte plusieurs paramètres physiques tels que l'information spectrale de la bande passante, le format de modulation, et la régénération optique. Cependant, d'autres paramètres sont encore nécessaires (par exemple, les puissances optiques des liens, le gain des amplificateurs) afin de faire fonctionner efficacement de grands réseaux. Dans ce contexte, il y a un besoin d'étudier les réseaux optiques existants ainsi que les différentes méthodes de prise en compte de la couche photonique dans le plan de contrôle. Le but est d'avoir un réseau optique automatique, flexible et programmable, mais surtout efficace de point de vue économique et opérationnel. L'utilisation de la technologie à grille flexible a un impact sur les réseaux optiques existants, où presque tous les équipements devront être remplacés, ce qui entraînera un coût additionnel pour les opérateurs. Dans ce travail, nous étudions les réseaux optiques actuels et évaluons l'impact de la flexibilité sur les infrastructures existantes. Ensuite, nous identifions plusieurs paramètres optiques à contrôler et proposons des extensions protocolaires afin d'intégrer ces paramètres dans un plan de contrôle GMPLS. De plus, nous développons les algorithmes de routage et de signalisation qui permettent la mise en œuvre d'un plan de contrôle efficace qui répond au besoin de la flexibilité. Enfin, l'ensemble de nos propositions et de nos solutions sont évaluées sur plusieurs topologies réseaux avec des modèles de trafic différents dans le but de valider leur pertinence<br>Dynamic and flexible optical networks are among the evolution scenarios of the optical transport networks. These form the basis of the new generation of optical networks of tomorrow and enable the effective deployment of services such as cloud computing. This evolution is intended to provide flexibility and automation to the optical layer. However, it results in additional complexity, particularly in terms of the management and control of this new network generation. Until recently, the standardized routing and signaling protocols have been taking into account several optical parameters like the spectral bandwidth information, modulation format, and optical regeneration. However, other parameters (e.g., link optical powers, gain of optical amplifiers) are still required in order to efficiently operate large optical networks. In this context, there is a need to study the existing optical networks and the different integration methods of the photonic layer in a control plane. The goal is to get an automatic optical network that is flexible, programmable, and at the same time efficient from an economical and operational perspective. The use of flexible grid technology has an impact on existing optical networks, where almost all the equipment must be replaced, resulting in an additional cost to network operators. In this work, we study the current optical networks and evaluate the impact of flexibility on the existing infrastructures. Then, we identify several physical parameters to be controlled and propose protocol extensions in order to integrate these parameters in the GMPLS control plane. In addition, we develop the routing and signaling algorithms that allow the implementation of an efficient control plane that addresses the need for flexibility. Finally, the set of our proposals and solutions are evaluated on multiple network topologies with different traffic patterns in order to validate their relevance
26
Papageorgiou, Vasileios. "Techno-economic analysis of Open Optical LineSystems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-237414.
Full textAbstract:
Technology innovations and capacity upgrades in optical networks have influenced the optical transmission. As a result, network operators are considering separating hardware and software components in order to achieve efficiency and promising savings during network operation and network lifecycle. This leads to resolving the vendor lock-in and opening up the optical networks architectures such that different kinds of disaggregation models can be supported in the DWDM transport layer.In this master thesis, a techno-economic analysis which compares the economical differences between an integrated and disaggregated optical network has been conducted. For the analysis, an actual test case scenario of a European interregional network has been utilized. The line system and transponders components, price lists and features are based on actual vendor components in today’s optical transport networks.According to the results, it has been concluded that all total cost investments required for an integrated or disaggregated approach of DWDM system are traffic dependent. Moreover, capital expenses of open architecture are influenced by business model policy in price reduction due to multiple vendors’ competition on transponders. Calculations demonstrated that a disaggregated approach can introduce considerable total cost savings about 21% less total investments that include 25% less costs for capital expenses and 3% higher cost for operational expenses on an average traffic volume of European network. Finally, by increasing 5-10 times the traffic volume of European network it has been noticed that disaggregated system reduced total cost by 39% and 43% respectively.<br>Tekniska innovationer och trafiktillväxt påverkar utvecklingen av optisk transmission. En konsekvens av detta är att nätoperatörer undersöker möjligheten att separera hårdvara och mjukvarukomponenter för öka effektiviteten och sänka kostnader för drift. Detta minskar inlåsning till enskilda leverantörer och öppnar upp dom optiska näten för att byggas med olika typer av disaggregering i DWDM transporten.I den här masteruppsatsen har en tekno-ekonomisk analys utförts avseende den ekonomiska skillnaden mellan integrerade och disaggregerade optiska nät. Ett verkligt nät scenario användes för analysen. Komponenter och kostnader för linjesystem och transpondrar är baserade på existerande system och prislistor i dagens nät. Enligt det erhållna resultatet har slutsatsen dragits att totala kostnaden för integrerade och öppna system är trafikberoende. Vidare så är investeringen för öppna system påverkad av pris reduktionen pga. konkurrens på transpondrar.Beräkningarna visar att disaggregerade system kan sänka kostnaderna med 21%, i dessa siffror ingår 25% lägre kostnad för investeringar och 3% högre driftkostnader.Slutligen, genom att öka trafikvolymen med 5 respektive 10 ggr från den ursprungliga trafik matrisen så kan de totala kostnaderna sänkas med 39% och 43%.
27
Manfrin, Stilante Koch. "Proposta e implementação de um receptor optoeletrônico integrado para redes ópticas passivas (PONs) empregando multiplexação por divisão de comprimento de onda (WDM)." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-01122015-101424/.
Full textAbstract:
O presente trabalho descreve o desenvolvimento e implementação de duas configurações distintas de um receptor optoeletrônico integrado. A primeira configuração é similar a um projeto encontrado na literatura mas apresenta diversas modificações que lhe conferiram melhor desempenho em comparação ao projeto original. A segunda configuração é uma nova proposta deste trabalho. O receptor foi desenvolvido e implementado visando sua aplicação em redes de comunicações ópticas passivas (PONs) de alta velocidade comutadas a pacote, para possibilitar a utilização da técnica de multiplexação em comprimento de onda (WDM), aumentando assim a capacidade de transmissão da rede, em particular no ramo de ligação da rede de serviços com o usuário final, denominado rede de acesso. O principal objetivo do receptor aqui desenvolvido foi proporcionar uma sintonia rápida entre os canais disponíveis na rede, possibilitando sua seleção num tempo inferior àquele necessário para a transmissão de um único pacote de informação, diminuindo assim o atraso de sintonia e, por conseguinte, a perda de informação. Para tanto, os circuitos integrados implementados e caracterizados referem-se aos circuitos de chaveamento eletrônico e do amplificador de transimpedância das duas configurações investigadas. Os dados experimentais obtidos para as duas configurações confirmaram a previsão de chaveamento dos canais de entrada num intervalo de tempo da ordem de alguns nanosegundos, o que é totalmente compatível com a velocidade de transmissão das aplicações a que se destina este receptor (aproximadamente 5 Gbits/s). Adicionalmente, são apresentados os dados experimentais relativos à freqüência de corte, ganho direto, isolação, relação on/off e características de ruído dos circuitos implementados.<br>The present work describes the design and implementation of two configurations of an integrated optoelectronic receiver. The first one is similar to a previously reported design but with some modifications to improve its performance. The second one is a new proposal of this work. The goal of the receiver design and implementation was its application in high bit rate packet-switched passive optical networks (PONs) employing the wavelength division multiplexing (WDM) technique to increase the network capacity, in particular on the connection branch of the network core with the final user, the access network. The main goal of the receiver design was to achieve a fast channel tuning, allowing a tuning time smaller than the required for the transmission of a single information packet, decreasing the tuning latency and, therefore, the rate of information packet loss. In order to accomplish this goal, the implemented and tested integrated circuits include the electronic switching circuit and the transimpedance amplifier for both configurations investigated. The measured data for both configurations confirm the expected input channel switching time results, of about a few nanoseconds, which is certainly useful for the expected bit rate of operation (approximate 5 Gbps). Additionally, experimental results concerning cutoff frequency and bandwidth, direct gain, isolation, on/off ratio, and noise characteristics of both implemented circuits are presented.
28
"All-optical devices for wavelength-division multiplexing (WDM) and optical time-division multiplexing (OTDM)." 2002. http://library.cuhk.edu.hk/record=b6073501.
Full textAbstract:
Wong Chi Sang.<br>"August 2002."<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2002.<br>Includes bibliographical references.<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Mode of access: World Wide Web.<br>Abstracts in English and Chinese.
29
"Design of survivable wavelength division multiplexed passive optical networks." 2003. http://library.cuhk.edu.hk/record=b5891515.
Full textAbstract:
by Chan Tsan Jim.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2003.<br>Includes bibliographical references (leaves 68-71).<br>Abstracts in English and Chinese.<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Introduction --- p.1<br>Chapter 1.2 --- Background --- p.2<br>Chapter 1.2.1 --- Introduction --- p.2<br>Chapter 1.2.2 --- Wavelength Division Multiplexing --- p.3<br>Chapter 1.2.3 --- Arrayed Waveguide Grating --- p.5<br>Chapter 1.2.4 --- Passive Optical Networks --- p.7<br>Chapter 1.3 --- Outline of the thesis --- p.10<br>Chapter Chapter 2 --- Review of Protection and Restoration Schemes --- p.12<br>Chapter 2.1 --- Introduction --- p.12<br>Chapter 2.2 --- Protection Schemes --- p.14<br>Chapter 2.2.1 --- Path Protection --- p.14<br>Chapter 2.2.2 --- Link Protection --- p.16<br>Chapter 2.3 --- Restoration Schemes --- p.17<br>Chapter 2.3.1 --- Path Restoration --- p.17<br>Chapter 2.3.2 --- Link Restoration --- p.18<br>Chapter 2.4 --- Protection and Restoration Schemes in PON --- p.18<br>Chapter 2.4.1 --- Protection Schemes in G.983.1 --- p.18<br>Chapter 2.4.2 --- Other Proposed Schemes --- p.21<br>Chapter Chapter 3 --- Design of WDM PON Network Architecture --- p.26<br>Chapter 3.1 --- Introduction --- p.26<br>Chapter 3.2 --- The Group Protection Architecture (GPA) --- p.27<br>Chapter 3.2.1 --- Network Design --- p.27<br>Chapter 3.2.2 --- Protection Mechanism --- p.28<br>Chapter 3.2.3 --- Wavelength Assignments --- p.30<br>Chapter 3.2.4 --- Power Budget Calculation --- p.32<br>Chapter 3.2.5 --- Crosstalk Analysis --- p.33<br>Chapter 3.2.6 --- Discussion --- p.35<br>Chapter 3.3 --- The Enhanced Group Protection Architecture (EGPA) --- p.36<br>Chapter 3.3.1 --- Introduction --- p.36<br>Chapter 3.3.2 --- Network Design --- p.37<br>Chapter 3.3.3 --- Protection Mechanism --- p.38<br>Chapter 3.3.4 --- Wavelength Assignments --- p.39<br>Chapter 3.3.5 --- Power Budget Calculation --- p.40<br>Chapter 3.3.6 --- Crosstalk Analysis --- p.41<br>Chapter 3.3.7 --- Discussion --- p.42<br>Chapter 3.4 --- The Hybrid Ring Architecture (HR) --- p.42<br>Chapter 3.4.1 --- Introduction --- p.42<br>Chapter 3.4.2 --- Network Design --- p.43<br>Chapter 3.4.3 --- Protection Mechanism --- p.44<br>Chapter 3.4.4 --- Wavelength Assignments --- p.45<br>Chapter 3.4.5 --- Power Budget Calculation --- p.46<br>Chapter 3.4.6 --- Crosstalk Analysis --- p.47<br>Chapter 3.4.7 --- Discussion --- p.47<br>Chapter 3.5 --- Comparison of the three schemes --- p.48<br>Chapter 3.6 --- Summary of the three schemes --- p.50<br>Chapter Chapter 4 --- Experimental Evaluation --- p.51<br>Chapter 4.1 --- Introduction --- p.51<br>Chapter 4.2 --- Experimental Setup --- p.51<br>Chapter 4.2.1 --- The GPA Scheme --- p.51<br>Chapter 4.2.2 --- The EGPA Scheme --- p.53<br>Chapter 4.2.3 --- The HR Scheme --- p.54<br>Chapter 4.3 --- Experimental Result --- p.55<br>Chapter 4.3.1 --- Optical Spectrum --- p.55<br>Chapter 4.3.2 --- Transmission Performance --- p.58<br>Chapter 4.3.3 --- Switching/Restoration Time --- p.61<br>Chapter 4.3.4 --- Crosstalk Penalty --- p.63<br>Chapter 4.4 --- Conclusion --- p.64<br>Chapter Chapter 5 --- Conclusion and Future Works --- p.65<br>Chapter 5.1 --- Introduction --- p.65<br>Chapter 5.2 --- Conclusion --- p.65<br>Chapter 5.3 --- Future Works --- p.66<br>References --- p.67
30
"Protection architectures for multi-wavelength optical networks." 2004. http://library.cuhk.edu.hk/record=b5896171.
Full textAbstract:
by Lee Chi Man.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2004.<br>Includes bibliographical references (leaves 63-65).<br>Abstracts in English and Chinese.<br>Chapter CHAPTER 1 --- INTRODUCTION --- p.5<br>Chapter 1.1 --- Background --- p.5<br>Chapter 1.1.1 --- Backbone network - Long haul mesh network problem --- p.5<br>Chapter 1.1.2 --- Access network ´ؤ Last mile problems --- p.8<br>Chapter 1.1.3 --- Network integration --- p.9<br>Chapter 1.2 --- SUMMARY OF INSIGHTS --- p.10<br>Chapter 1.3 --- Contribution of this thesis --- p.11<br>Chapter 1.4 --- Structure of the thesis --- p.11<br>Chapter CHAPTER 2 --- PREVIOUS PROTECTION ARCHITECTURES --- p.12<br>Chapter 2.1 --- Introduction --- p.12<br>Chapter 2.2 --- Traditional physical protection architectures in metro area --- p.13<br>Chapter 2.2.1 --- Self healing ring --- p.17<br>Chapter 2.2.2 --- Some terminology in ring protection --- p.13<br>Chapter 2.2.3 --- Unidirectional path-switched rings (UPSR) [17] --- p.13<br>Chapter 2.2.4 --- Bidirectional line-switched rings (BLSR) [17] --- p.14<br>Chapter 2.2.5 --- Ring interconnection and dual homing [17] --- p.16<br>Chapter 2.3 --- Traditional physical protection architectures in access networks --- p.17<br>Chapter 2.3.1 --- Basic architecture in passive optical networks --- p.17<br>Chapter 2.3.2 --- Fault management issue in access networks --- p.18<br>Chapter 2.3.3 --- Some protection architectures --- p.18<br>Chapter 2.4 --- Recent protection architectures on a ccess networks --- p.21<br>Chapter 2.4.1 --- Star-Ring-Bus architecture --- p.21<br>Chapter 2.5 --- Concluding remarks --- p.22<br>Chapter CHAPTER 3 --- GROUP PROTECTION ARCHITECTURE (GPA) FOR TRAFFIC RESTORATION IN MULTI- WAVELENGTH PASSIVE OPTICAL NETWORKS --- p.23<br>Chapter 3.1 --- Background --- p.23<br>Chapter 3.2 --- Organization of Chapter 3 --- p.24<br>Chapter 3.3 --- Overview of Group Protection Architecture --- p.24<br>Chapter 3.3.1 --- Network architecture --- p.24<br>Chapter 3.3.2 --- Wavelength assignment --- p.25<br>Chapter 3.3.3 --- Normal operation of the scheme --- p.25<br>Chapter 3.3.4 --- Protection mechanism --- p.26<br>Chapter 3.4 --- Enhanced GPA architecture --- p.27<br>Chapter 3.4.1 --- Network architecture --- p.27<br>Chapter 3.4.2 --- Wavelength assignment --- p.28<br>Chapter 3.4.3 --- Realization of network elements --- p.28<br>Chapter 3.4.3.1 --- Optical line terminal (OLT) --- p.28<br>Chapter 3.4.3.2 --- Remote node (RN) --- p.29<br>Chapter 3.4.3.3 --- Realization of optical network unit (ONU) --- p.30<br>Chapter 3.4.4 --- Protection switching and restoration --- p.31<br>Chapter 3.4.5 --- Experimental demonstration --- p.31<br>Chapter 3.5 --- Conclusion --- p.33<br>Chapter CHAPTER 4 --- A NOVEL CONE PROTECTION ARCHITECTURE (CPA) SCHEME FOR WDM PASSIVE OPTICAL ACCESS NETWORKS --- p.35<br>Chapter 4.1 --- Introduction --- p.35<br>Chapter 4.2 --- Single-side Cone Protection Architecture (SS-CPA) --- p.36<br>Chapter 4.2.1 --- Network topology of SS-CPA --- p.36<br>Chapter 4.2.2 --- Wavelength assignment of SS-CPA --- p.36<br>Chapter 4.2.3 --- Realization of remote node --- p.37<br>Chapter 4.2.4 --- Realization of optical network unit --- p.39<br>Chapter 4.2.5 --- Two types of failures --- p.40<br>Chapter 4.2.6 --- Protection mechanism against failure --- p.40<br>Chapter 4.2.6.1 --- Multi-failures of type I failure --- p.40<br>Chapter 4.2.6.2 --- Type II failure --- p.40<br>Chapter 4.2.7 --- Experimental demonstration --- p.41<br>Chapter 4.2.8 --- Power budget --- p.42<br>Chapter 4.2.9 --- Protection capability analysis --- p.42<br>Chapter 4.2.10 --- Non-fully-connected case and its extensibility for addition --- p.42<br>Chapter 4.2.11 --- Scalability --- p.43<br>Chapter 4.2.12 --- Summary --- p.43<br>Chapter 4.3 --- Comparison between GPA and SS-CPA scheme --- p.43<br>Chapter 4.1 --- Resources comparison --- p.43<br>Chapter 4.2 --- Protection capability comparison --- p.44<br>Chapter 4.4 --- Concluding remarks --- p.45<br>Chapter CHAPTER 5 --- MUL 77- WA VELENGTH MUL TICAST NETWORK IN PASSIVE OPTICAL NETWORK --- p.46<br>Chapter 5.1 --- Introduction --- p.46<br>Chapter 5.2 --- Organization of this chapter --- p.47<br>Chapter 5.3 --- Simple Group Multicast Network (SGMN) scheme --- p.47<br>Chapter 5.3.1 --- Network design principle --- p.47<br>Chapter 5.3.2 --- Wavelength assignment of SGMN --- p.48<br>Chapter 5.3.3 --- Realization of remote node --- p.49<br>Chapter 5.3.3 --- Realization of optical network unit --- p.50<br>Chapter 5.3.4 --- Power budget --- p.51<br>Chapter 5.4 --- A mulTI- wa velength a ccess network with reconfigurable multicast …… --- p.51<br>Chapter 5.4.1 --- Motivation --- p.51<br>Chapter 5.4.2 --- Background --- p.51<br>Chapter 5.4.3 --- Network design principle --- p.52<br>Chapter 5.4.4 --- Wavelength assignment --- p.52<br>Chapter 5.4.5 --- Remote Node design --- p.53<br>Chapter 5.4.6 --- Optical network unit design --- p.54<br>Chapter 5.4.7 --- Multicast connection pattern --- p.55<br>Chapter 5.4.8 --- Multicast group selection in OLT --- p.57<br>Chapter 5.4.9 --- Scalability --- p.57<br>Chapter 5.4.10 --- Experimental configuration --- p.58<br>Chapter 5.4.11 --- Concluding remarks --- p.59<br>Chapter CHAPTER 6 --- CONCLUSIONS --- p.60<br>LIST OF PUBLICATIONS: --- p.62<br>REFERENCES: --- p.63
31
"A tunable-channel multi-access wavelength division multiplexed network and surveillance schemes for optical cross-connects." 1999. http://library.cuhk.edu.hk/record=b5889946.
Full textAbstract:
by Eddie Ting Pong Kong.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1999.<br>Includes bibliographical references (leaves 61-68).<br>Abstracts in English and Chinese.<br>Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Optical Network Architecture --- p.1<br>Chapter 1.2 --- High-Speed All-Optical Tunable-Channel Multi-Access Networks --- p.3<br>Chapter 1.3 --- Fault Surveillance of Optical Cross-Connects in Wavelength Routing Network --- p.3<br>Chapter 1.4 --- Outline of the Thesis --- p.5<br>Chapter 2 --- Optical Multi-Access Networks --- p.6<br>Chapter 2.1 --- All-Optical Networks --- p.6<br>Chapter 2.2 --- Optical Multi-Access Schemes --- p.8<br>Chapter 2.2.1 --- Wavelength-Division Multi-Access (WDMA) --- p.9<br>Chapter 2.2.2 --- Time-Division Multi-Access (TDMA) --- p.12<br>Chapter 2.2.3 --- Subcarrier Multi-Access (SCMA) --- p.14<br>Chapter 2.3 --- Design Considerations --- p.14<br>Chapter 3 --- All-Optical Tunable-Channel Multi-Access Networks --- p.18<br>Chapter 3.1 --- Tunable-Channel Multi-Access Networks --- p.19<br>Chapter 3.2 --- Protocols for TCMA Networks --- p.20<br>Chapter 3.3 --- Photonic Implementation of a Wavelength Division TCMA Network with Time- Slot Access --- p.23<br>Chapter 3.3.1 --- Proposed Network Architecture --- p.25<br>Chapter 3.3.2 --- Experimental Results --- p.30<br>Chapter 3.3.3 --- Discussion --- p.34<br>Chapter 3.3.4 --- Summary --- p.35<br>Chapter 4 --- Fault Surveillance for Optical Cross-Connects in Wavelength Routing Networks --- p.36<br>Chapter 4.1 --- Wavelength Routing Networks --- p.37<br>Chapter 4.2 --- Options in Fault Surveillance --- p.39<br>Chapter 4.3 --- Optical Path Surveillance of Optical Cross-Connects in Wavelength Routing Networks --- p.41<br>Chapter 4.3.1 --- Scanning Amplified Spontaneous Emission Identification Surveillance Scheme --- p.43<br>Chapter 4.3.2 --- Pilot-Tone Based Surveillance and Removal Scheme --- p.49<br>Chapter 4.4 --- Summary --- p.55<br>Chapter 5 --- Conclusion --- p.57<br>Chapter 5.1 --- Summary of the Thesis --- p.57<br>Chapter 5.2 --- Future Work --- p.60<br>Bibliography --- p.61<br>Publication List --- p.59
32
"Optical multicast overlay and survivable architectures in high speed multi-wavelength optical access networks." Thesis, 2011. http://library.cuhk.edu.hk/record=b6075535.
Full textAbstract:
Nowadays, broadband applications, such as interactive video and multimedia services, have further increased the demand of bandwidth, and thus make high speed multi-wavelength optical access network highly desirable. Wavelength division multiplexing passive optical network (WDM-PON) is a promising candidate to realize the next generation optical access networks due to its dedicated bandwidth for each subscriber and more flexible bandwidth management. As the network traffic is becoming more data-centric, more networking capabilities are required to provide the data service in a more flexible and reliable way. In this thesis, we have proposed and investigated several interesting optical multicast overlay schemes and network protection architectures for WDM-PONs. Optical multicast overlay technique can support the additional multicast transmission on the existing point-to-point data services, while network protection architectures can assure network availability with short traffic restoration time. We will briefly discuss our work in the following sub-topics.<br>Optical multicast overlay in WDM-PON: Traditional WDM-PONs support only two-way point-to-point data transmission between the optical line terminal (OLT) and the individual subscribers, via the respective designated set of wavelengths. To enhance the network flexibility, it is more desirable to support various different modes of data or video delivery such as broadcast and multicast, in addition to point-to-point transmissions. In this thesis, we systematically investigate the problems and propose our several feasible schemes to overlay multicast transmission onto the existing point-to-point traffic in a WDM-PON. In the first approach, the control of the multicast transmission is achieved by a simple polarization-assisted scheme at the OLT. By the cross-use of wavelengths, a separate path is provided for the multicast differential phase shift keying (DPSK) data from downstream point-to-point amplitude shift keying (ASK) data without additional light sources, which guarantees the transmission performances in both directions, since the upstream ASK signal is imposed on the multicast DPSK signal. We have also demonstrated its variant, in which an optical switch replaces the polarization-assisted control for multicast transmission. The second approach is based on the optical carrier suppression (OCS) technique at the OLT so as to generate the optical subcarriers or sidebands for multicast ASK data modulation. The downstream unicast data is modulated in DPSK format, which will be re-modulated with the upstream ASK data at the respective optical network unit (ONU). As the downstream unicast signal and the upstream signal are calTied on different fiber feeders, while the upstream signal and the multicast signal are carried on different subcarriers, though on the same fiber feeder, the possible Rayleigh backscattering effect is much alleviated. In the third scheme, by using subcarrier modulation technique, we have first successfully overlaid two independent multicast data streams simultaneously onto a WDM-PON, which is believed to further enhance the network capability for multiple destination traffic and improve the cost effectiveness for the future network. Finally, we will provide a comprehensive comparison on all the proposed schemes in this topic.<br>Survivable network architectures for WDM-PONs: A survivable WDM-PON architecture which can provide self-protection is attractive to avoid enormous loss in data and business due to fiber cuts. To facilitate the network management, the protection switching is realized at the OLT. In this thesis, a simple centrally controlled survivable WDM-PON architecture employing OCS technique is proposed. Protection switching at the OLT employs electrical switches to control the clock signal for the protection sub-carrier generation, via optical carrier suppression. Both distribution and feeder fibers are protected simultaneously. By employing inverse-RZ (IRZ) format for the downstream transmission and non-retum-to-zero (NRZ) for the upstream re-modulated signal, the optical network units are kept colorless and simple. On the other hand, wavelength division multiplexing/time division multiplexing (WDM/TDM) hybrid network, which combines TDM technology and WDM technology, can further increase the network reach, transmission capacity, and reduces the cost per subscriber. Although the bandwidth per subscriber in a WDM/TDM PON is less than that in a WDM-PON, it is still considered as a smooth migration from TDM-PON to WDM-PON. In this thesis, we have proposed a novel WDM/TDM PON architecture which can provide self-protection using a ring topology to connect the subscribers. Finally, we will provide a comprehensive comparison on all the proposed schemes in this topic.<br>Qiu, Yang.<br>Adviser: Chun-Kit Chan.<br>Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: .<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references (leaves 130-140).<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Abstract also in Chinese.
33
"Performance analysis on multi-dimensional optical routing networks." 2002. http://library.cuhk.edu.hk/record=b5891250.
Full textAbstract:
Zhang Yu.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2002.<br>Includes bibliographical references (leaves 67-72).<br>Abstracts in English and Chinese.<br>Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Overview of Optical Networking --- p.1<br>Chapter 1.2 --- Mechanism in Optical Routing Networks --- p.3<br>Chapter 1.3 --- Related Work on Optical Routing Networks --- p.4<br>Chapter 1.4 --- The Motivation of This Thesis --- p.7<br>Chapter 1.5 --- Thesis Structure --- p.8<br>Chapter 2 --- Technologies for Multi-dimensional Optical Routing Networks --- p.10<br>Chapter 2.1 --- Background --- p.10<br>Chapter 2.2 --- Multi-fiber WDM Networks --- p.11<br>Chapter 2.2.1 --- Phased-Array-Based WDM Device --- p.11<br>Chapter 2.2.2 --- Wavelength-tunable lasers --- p.11<br>Chapter 2.2.3 --- Tunable optical Filter --- p.12<br>Chapter 2.2.4 --- Wavelength Converter --- p.13<br>Chapter 2.3 --- OCDM/WDM --- p.16<br>Chapter 2.3.1 --- Optical En/Decoder --- p.17<br>Chapter 2.3.2 --- Optical Switch --- p.18<br>Chapter 2.3.3 --- Optical Code Conversion --- p.18<br>Chapter 2.4 --- OTDM/WDM --- p.21<br>Chapter 2.4.1 --- Fast Optical Switch --- p.22<br>Chapter 2.4.2 --- Optical Time Slot Interchanger (OTSI) --- p.22<br>Chapter 2.5 --- Conclusion --- p.23<br>Chapter 3 --- Performance of Code/Wavelength Routing Networks --- p.24<br>Chapter 3.1 --- Background --- p.24<br>Chapter 3.2 --- Reconfiguration Capability --- p.25<br>Chapter 3.3 --- Analytic Models --- p.27<br>Chapter 3.3.1 --- Trunk Switched Model --- p.27<br>Chapter 3.3.2 --- Assumptions --- p.28<br>Chapter 3.3.3 --- Blocking of the Paths with Various Configurations --- p.29<br>Chapter 3.4 --- Numerical Results --- p.34<br>Chapter 3.5 --- Conclusion --- p.35<br>Chapter 4 --- Decomposition Schemes --- p.40<br>Chapter 4.1 --- Introduction --- p.40<br>Chapter 4.2 --- Inclusive Converted Networks --- p.41<br>Chapter 4.3 --- Decompositions --- p.43<br>Chapter 4.3.1 --- Spatial Decomposition (S.D.) --- p.43<br>Chapter 4.3.2 --- Dimensional Decomposition (D.D.) --- p.44<br>Chapter 4.3.3 --- Iterative Decompositions --- p.45<br>Chapter 4.4 --- Conclusion --- p.46<br>Chapter 5 --- Performance of Multi-Dimensional Optical Routing Networks --- p.48<br>Chapter 5.1 --- Homogeneous Trunk Switched Networks --- p.48<br>Chapter 5.2 --- Analytical Model --- p.49<br>Chapter 5.3 --- Utilization Gain --- p.53<br>Chapter 5.4 --- Conversion Gain --- p.54<br>Chapter 5.5 --- Comparison on the Utilization Gain by Multiplexing and by Conversion --- p.56<br>Chapter 5.6 --- Conclusion --- p.57<br>Chapter 6 --- Conclusion --- p.65<br>Chapter 6.1 --- Summary of the Thesis --- p.65<br>Chapter 6.2 --- Future Work --- p.66
34
"Network capacity improvement by multicast in elastic optical networks and physical-layer network coding in TDM-PON." 2012. http://library.cuhk.edu.hk/record=b5549153.
Full textAbstract:
如今，隨著信息爆炸，骨幹網絡和城域網絡的容量需求已成倍增加。因此，如何提高網絡容量正成為學術界和工業界的熱門話題。可變帶寬光網絡技術通過為不同速率的數據傳輸分配剛剛足夠的帶寬來提高網絡容量，而物理層網絡編碼技術（PNC）在沒有復雜的硬件要求下可以增加網絡容量。在這篇論文中，我們首先提出將組播應用於可變帶寬光網絡來提高網絡容量。我們進一步提出將物理層網絡編碼技術應用於時分複用光接入網絡（TDM-PON），從而來提高全光虛擬專用通信（VPN）的網絡容量。<br>可變帶寬光網絡中組播的分析<br>可變帶寬光網絡相比傳統的波分複用光網絡（WDM）可以提高骨幹網絡的頻譜利用率，因為它可以靈活地分配剛剛足夠的帶寬。另一方面，光網絡層上的組播是一種高效的支持點對多點的通信技術。在未來的許多寬帶服務中，點對多點應用服務是必不可少的，通過光組播技術可以節省頻譜帶寬和接發器的數目。為了進一步提高網絡容量，我們建議在可變帶寬光網絡中進行組播。雖然關於可變帶寬光網絡的研究已經有很多了，但據我們所知，關於可變帶寬光網絡的組播尚未被研究。我們通過兩種有效算法來解決可變帶寬光網絡組播的路由和頻譜分配問題。採用相同的路由和波長/頻譜分配算法，我們研究了有靈活帶寬分配產生的好處，通過比較可變帶寬光網絡和傳統波分複用網絡的組播。我們也探討了由非均勻帶寬分配造成的頻譜間隙對提高網絡容量的影響。<br>時分複用光接入網中(TDM-PON)的物理層網絡編碼技術（PNC）<br>網絡編碼是一種很有前途的技術，可以提高網絡的容量和健全性。雖然最近有關於在時分複用光接入網中進行網絡編碼的研究，應用於同一個光接入網絡中的光網絡單元（ONU）之間的通信，但在這些研究中的最大的網絡容量提高只有33。此外，在光網路終端（OLT）和光網絡單元中還需要大量的緩衝來存儲VPN數據。在時分複用光接入網中，全光VPN網絡可以重新將VPN數據傳送到相應的ONU，實現ONU之間的直接通信，不需要在OLT進行光-電-光的轉換。在這裡，據我們所知，我們第一次用實驗驗證了一種新方案，將物理層網絡編碼技術應用於TDM-PON，使得全光VPN通信的網絡容量增加了一倍。我們也提出了在光接入網中的遠程節點處使用光環路器，以此減少VPN通信的插入損耗。當兩個ONU之間需要進行雙向通信，可以通過利用PNC來實現全雙工傳輸，相比傳統半雙工的全光VPN方案，網絡容量可以提高100。實驗結果表明，可以實現無差錯全雙工VPN通信，相比半雙工通信功率補償不超過3分貝，而且這方案中ONU間的同步是不需要的。<br>Nowadays, with the information explosion, the capacity demand has been exponentially increasing in backbone networks and metro networks. Therefore, it is becoming a hot topic for both academic and industry to improve the network capacity. Elastic technologies are promising to scale up the network capacity due to just-enough bandwidth allocation for different data-rate traffic request, while physical-layer network coding (PNC) can increase the throughput without complex requirement on hardware. In this thesis, we first propose a novel scheme to improve the network capacity by implementing multicast in elastic optical networks. We further present the capacity improvement by integrating PNC in time-division multiplexing passive optical network (TDM-PON) for all-optical virtual private network (VPN) communications.<br>Analysis of multicast in elastic optical networks<br>Elastic optical networks can increase the spectrum utilization of backbone networks compared to the traditional wavelength-division multiplexing (WDM) networks due to flexible and just-enough bandwidth allocation. On the other hand, multicast over the optical layer is a bandwidth-efficient communication technique which supports point-to-multipoint applications. As many broadband services in the future can be from one source to several destinations, it is essential to enable optical multicast to save bandwidth as well as transceivers. To further improve the network throughput, we propose to implement multicast in spectrum elastic optical networks. Although many investigations on elastic optical networks have been carried out, to the best of our knowledge, the performance of multicast in elastic optical networks have not yet been studied. We develop two efficient multicast heuristics to solve the multicast routing and spectrum allocation (MC-RSA) problem in elastic optical networks. By adopting the same routing and wavelength/spectrum allocation algorithms, the benefits of elastic optical networks resulting from flexible bandwidth allocation are studied for multicast compared to the traditional WDM networks. We also investigate the impact of spectral gap caused by non-uniform bandwidth allocation on the improvement of network throughput.<br>Physical-layer network coding (PNC) in TDM-PON<br>Network coding is a promising technique to improve the network throughput and robustness. Although network coding in TDM-PON has been recently investigated for exchanging information among optical network units (ONUs) in the same PON, the maximum capacity improvement of inter-ONU communications in these schemes is only 33%. In addition, large electrical buffer is required to store the VPN traffic at both optical line terminal (OLT) and ONUs. All-optical VPN in TDM-PON can optically reroute VPN traffic to the destined ONU without optical-electrical-optical conversion at OLT, which enables direct communications among ONUs. Here, to the best of our knowledge, for the first time, we experimentally demonstrate a novel PNC scheme integrated in TDM-PON for all-optical VPN communications to double the network throughput. A unique remote node that uses optical circulators to reduce the insertion loss of VPN communications is also proposed. By transmitting two inter-ONU traffic streams of opposite direction simultaneously using PNC (full-duplex), it can improve the network throughput by 100% compared to the traditional all-optical VPN schemes (half-duplex). Experiments show that error-free full-duplex VPN communications are achieved, and the power penalty is no more than 3 dB. Synchronization of ONUs is not required for the proposed scheme.<br>Detailed summary in vernacular field only.<br>Detailed summary in vernacular field only.<br>Detailed summary in vernacular field only.<br>Detailed summary in vernacular field only.<br>Detailed summary in vernacular field only.<br>Wang, Qike.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2012.<br>Includes bibliographical references (leaves 43-48).<br>Abstracts also in Chinese.<br>Chapter Chapter 1 --- Background --- p.1<br>Chapter 1.1 --- Elastic optical networks --- p.1<br>Chapter 1.2 --- Multiscast in WDM networks --- p.5<br>Chapter 1.3 --- Network coding in passive optical network (PON) --- p.7<br>Chapter 1.4 --- All-optical virtual private nework (VPN) in PON --- p.11<br>Chapter 1.5 --- Contribution of this thesis --- p.13<br>Chapter 1.6 --- Organization of this thesis --- p.15<br>Chapter Chapter 2 --- Analysis of multicast in elastic optical networks --- p.16<br>Chapter 2.1 --- Introduction --- p.16<br>Chapter 2.2 --- Network model and heuristics --- p.18<br>Chapter 2.2.1 --- Multicast-capable node architecture --- p.18<br>Chapter 2.2.2 --- Multicast goup size (MGS) factor --- p.19<br>Chapter 2.2.3 --- Network resource and assumption --- p.19<br>Chapter 2.2.4 --- Multicast routing and spectrum allocation (MC-RSA) heuristics --- p.20<br>Chapter 2.3 --- Numerical results --- p.22<br>Chapter 2.4 --- Summary --- p.27<br>Chapter Chapter 3 --- Physical-layer network coding (PNC) in TDM-PON --- p.28<br>Chapter 3.1 --- Introduction --- p.28<br>Chapter 3.2 --- A novel PNC in TDM-PON scheme for all-optical VPN applications --- p.31<br>Chapter 3.2.1 --- System architecture --- p.31<br>Chapter 3.2.2 --- Implementation of PNC --- p.32<br>Chapter 3.2.3 --- Management of wavelength collision --- p.33<br>Chapter 3.3 --- Experiemnts and results --- p.35<br>Chapter 3.4 --- Summary --- p.39<br>Chapter Chapter 4 --- Conclusion and Future Works --- p.40<br>Chapter 4.1 --- Conclusion of this thesis --- p.40<br>Chapter 4.2 --- Future works --- p.41<br>Bibliography --- p.43<br>List of Publications --- p.50
35
"Design of optical burst switches based on dual shuffle-exchange network and deflection routing." 2003. http://library.cuhk.edu.hk/record=b5891514.
Full textAbstract:
Choy Man Ting.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2003.<br>Includes bibliographical references (leaves 66-69).<br>Abstracts in English and Chinese.<br>Acknowledgments --- p.ii<br>Abstract --- p.v<br>Table of Contents --- p.vii<br>List of figures --- p.viii<br>Chapter Chapter 1 --- p.12<br>Chapter 1.1 --- OBS Network Architecture --- p.3<br>Chapter 1.2 --- Offset Time and Reservation Schemes --- p.5<br>Chapter 1.3 --- Research Objectives --- p.7<br>Chapter 1.4 --- Overview --- p.8<br>Chapter Chapter 2 --- p.9<br>Chapter 2.1 --- WDM crossbar architectures --- p.9<br>Chapter 2.2 --- Switch Based on Optical Crossbars --- p.10<br>Chapter 2.3 --- Switch Based on Wavelength Grating Routers --- p.11<br>Chapter Chapter 3 --- p.14<br>Chapter 3.1 --- Basics of Dual Shuffle Exchange Network --- p.14<br>Chapter 3.2 --- Dual Shuffle-exchange Network --- p.16<br>Chapter 3.3 --- Proposed Architecture based on DSN --- p.19<br>Chapter 3.4 --- Analysis on blocking due to output contention --- p.20<br>Chapter 3.5 --- Implementation issues on the 4x4 switching module --- p.23<br>Chapter 3.6 --- Analysis: Non-blocking versus banyan --- p.25<br>Chapter Chapter 4 --- p.30<br>Chapter 4.1 --- First Scheme --- p.30<br>Chapter 4.2 --- Simulation on the first scheme --- p.33<br>Chapter 4.3 --- Second Scheme: Tunable wavelength converter --- p.37<br>Chapter 4.4 --- Third Scheme: Route to specific wavelength port --- p.42<br>Chapter 4.5 --- Analysis on blocking due to insufficient stages --- p.46<br>Chapter Chapter 5 --- p.49<br>Chapter 5.1 --- Delay analysis of DSN --- p.49<br>Chapter 5.2 --- Vertical Expansion --- p.51<br>Chapter 5.3 --- Simulation results on vertical expansion --- p.52<br>Chapter 5.4 --- Building DSN with 8x8 MEMS switches --- p.54<br>Chapter 5.5 --- Prove of the proposed Quarter shuffle network --- p.56<br>Chapter 5.6 --- Comparison between Quarter shuffle and doubled links approaches --- p.58<br>Chapter Chapter 6 --- p.64<br>Conclusion --- p.64<br>Bibliography --- p.66
36
Jiang, Wei Chen Ray T. "Wavelength-selective micro- and nano-photonic devices for wavelength division multiplexing networks." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1581/jiangw09150.pdf.
Full text
37
Jiang, Wei. "Wavelength-selective micro- and nano-photonic devices for wavelength division multiplexing networks." Thesis, 2005. http://hdl.handle.net/2152/1581.
Full text
38
"All-optical signal processing techniques to alleviate homodyne crosstalk in optical networks." 2004. http://library.cuhk.edu.hk/record=b5891904.
Full textAbstract:
Ku Yuen Ching.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2004.<br>Includes bibliographical references (leaves 59-62).<br>Abstracts in English and Chinese.<br>Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Overview of optical networking --- p.1<br>Chapter 1.2 --- Multi-wavelength optical networks --- p.3<br>Chapter 1.2.1 --- Building blocks --- p.3<br>Chapter 1.2.2 --- Performance limitations --- p.6<br>Chapter 1.3 --- Related work about homodyne crosstalk --- p.8<br>Chapter 1.4 --- The motivation of this thesis --- p.9<br>Chapter 1.5 --- Outline of this thesis --- p.10<br>Chapter 2 --- Crosstalk in WDM Networks --- p.11<br>Chapter 2.1 --- Introduction --- p.11<br>Chapter 2.2 --- Classification of optical crosstalk --- p.11<br>Chapter 2.2.1 --- Nonlinear crosstalk --- p.12<br>Chapter 2.2.2 --- Linear crosstalk --- p.13<br>Chapter 2.3 --- Crosstalk characteristics --- p.14<br>Chapter 2.3.1 --- Polarization states --- p.16<br>Chapter 2.3.2 --- Wavelengths --- p.17<br>Chapter 2.3.3 --- Phases --- p.17<br>Chapter 2.4 --- Crosstalk mitigation techniques --- p.18<br>Chapter 2.4.1 --- Manchester-encoding --- p.18<br>Chapter 2.4.2 --- Bit-pattern misalignment --- p.19<br>Chapter 2.4.3 --- Intra-bit modulation --- p.20<br>Chapter 2.4.4 --- Phase scrambling --- p.20<br>Chapter 2.5 --- Performance analysis --- p.21<br>Chapter 2.5.1 --- Gaussian approximation --- p.22<br>Chapter 2.5.2 --- Saddlepoint approximation --- p.24<br>Chapter 2.5.3 --- Modified Chernoff bound --- p.25<br>Chapter 2.5.4 --- Comparison --- p.26<br>Chapter 2.6 --- Summary --- p.26<br>Chapter 3 --- Optical Regeneration for Crosstalk Mitigation --- p.28<br>Chapter 3.1 --- Introduction --- p.28<br>Chapter 3.2 --- Optical regeneration techniques --- p.28<br>Chapter 3.2.1 --- Fiber based gate --- p.30<br>Chapter 3.2.2 --- Semiconductor based gate --- p.31<br>Chapter 3.3 --- Crosstalk mitigation using SOA-MZI --- p.33<br>Chapter 3.3.1 --- The experimental setup --- p.35<br>Chapter 3.3.2 --- All-active SOA-MZI --- p.36<br>Chapter 3.3.3 --- Results and discussion --- p.36<br>Chapter 3.3.4 --- Summary --- p.39<br>Chapter 3.4 --- Crosstalk mitigation using SPM spectrum filtering --- p.39<br>Chapter 3.4.1 --- The experimental setup --- p.40<br>Chapter 3.4.2 --- Results and discussion --- p.41<br>Chapter 3.4.3 --- Summary --- p.44<br>Chapter 4 --- Polarimetric Approach for Crosstalk Mitigation for Both 00K and DPSK Format --- p.45<br>Chapter 4.1 --- Introduction --- p.45<br>Chapter 4.2 --- Experimental setup --- p.46<br>Chapter 4.3 --- Results and discussion --- p.47<br>Chapter 4.4 --- Summary --- p.49<br>Chapter 5 --- Crosstalk Accumulation Analysis --- p.50<br>Chapter 5.1 --- Introduction --- p.50<br>Chapter 5.2 --- Theory and model --- p.51<br>Chapter 5.3 --- Results and discussion --- p.54<br>Chapter 5.4 --- Summary --- p.56<br>Chapter 6 --- Summary and Future Works --- p.57<br>Chapter 6.1 --- Summary of the thesis --- p.57<br>Chapter 6.2 --- Future works --- p.58<br>Bibliography --- p.59<br>Chapter A. --- Appendix A - List of publications --- p.63
39
"Self-healing network architectures for multiwavelength optical metro/access networks." 2006. http://library.cuhk.edu.hk/record=b5892832.
Full textAbstract:
Sun Xiaofeng.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2006.<br>Includes bibliographical references (leaves 61-64).<br>Abstracts in English and Chinese.<br>Chapter CHAPTER 1 --- INTRODUCTION --- p.1<br>Chapter 1.1 --- Optical network evolution --- p.2<br>Chapter 1.1.1 --- Submarine and terrestrial long-haul fibre systems --- p.2<br>Chapter 1.1.2 --- Metropolitan networks --- p.3<br>Chapter 1.1.3 --- Access networks --- p.4<br>Chapter 1.2 --- Motivation of this thesis --- p.6<br>Chapter 1.3 --- Outline of this thesis --- p.7<br>Chapter CHAPTER 2 --- PREVIOUS SELF-HEALING NETWORK ARCHITECTURES --- p.9<br>Chapter 2.1 --- Introduction --- p.10<br>Chapter 2.1.1 --- Previous protection architectures for access networks --- p.10<br>Chapter 2.1.2 --- Previous protection architectures for metro access networks --- p.13<br>Chapter 2.3 --- Previous protection architectures for metro backbone networks --- p.15<br>Chapter 2.3.1 --- Unidirectional path-switched rings (UPSR) --- p.15<br>Chapter 2.3.2 --- Bidirectional line-switched rings (BLSR) --- p.16<br>Chapter 2.3.3 --- Ring interconnection and dual homing --- p.17<br>Chapter 2.4 --- Summary --- p.19<br>Chapter CHAPTER 3 --- SELF-HEALING NETWORK ARCHITECTURE FOR WDM OPTICAL ACCESS NETWORKS --- p.20<br>Chapter 3.1 --- Introduction --- p.21<br>Chapter 3.2 --- Star-Ring Protection Architecture (SRPA) --- p.21<br>Chapter 3.2.1 --- Motivation --- p.21<br>Chapter 3.2.2 --- Network topology of SRPA --- p.22<br>Chapter 3.2.3 --- Wavelength assignment of SRPA --- p.22<br>Chapter 3.2.4 --- Structure of ONU --- p.23<br>Chapter 3.2.5 --- Protection mechanism --- p.25<br>Chapter 3.2.6 --- Experimental demonstration --- p.26<br>Chapter 3.2.7 --- Power budget --- p.28<br>Chapter 3.2.8 --- Summary --- p.28<br>Chapter 3.3 --- Duplicated-Tree Protection Architecture (DTPA) --- p.28<br>Chapter 3.3.1 --- Motivation --- p.28<br>Chapter 3.3.2 --- Network topology and wavelength assignment --- p.29<br>Chapter 3.3.3 --- Structure of OLT --- p.30<br>Chapter 3.3.4 --- Protection mechanism --- p.31<br>Chapter 3.3.5 --- Experimental demonstration --- p.33<br>Chapter 1.1.1 --- Summary --- p.34<br>Chapter 1.4 --- Summary --- p.35<br>Chapter CHAPTER 4 --- SINGLE-FIBER SELF-HEALING WDM RING NETWORK ARCHITECTURE FOR METRO ACCESS NETWORKS --- p.36<br>Chapter 4.1 --- Introduction --- p.37<br>Chapter 4.2 --- Network architecture and wavelength assignment --- p.37<br>Chapter 4.3 --- Structure of access node --- p.39<br>Chapter 4.4 --- Structure of hub node --- p.40<br>Chapter 4.5 --- Protection mechanism --- p.42<br>Chapter 4.6 --- Experimental demonstration --- p.43<br>Chapter 4.7 --- Optimization of access node --- p.47<br>Chapter 4.8 --- Scalability --- p.48<br>Chapter 4.9 --- Summary --- p.49<br>Chapter CHAPTER 5 --- SELF-HEALING WDM MESH NETWORK ARCHITECTURE FOR METRO BACKBONE NETWORKS… --- p.50<br>Chapter 5.1 --- Introduction --- p.51<br>Chapter 5.2 --- Network architecture and node structure --- p.51<br>Chapter 5.3 --- Protection mechanism --- p.53<br>Chapter 5.4 --- Experimental demonstration --- p.55<br>Chapter 5.5 --- Summary --- p.57<br>Chapter CHAPTER 6 --- SUMMARYAND FUTURE WORKS --- p.58<br>Chapter 6.1 --- Summary of the Thesis --- p.59<br>Chapter 6.2 --- Future Works --- p.59<br>LIST OF PUBLICATIONS --- p.61<br>REFERENCES --- p.62
40
"A multicast overlay scheme for wavelength division multiplexed passive optical networks." 2009. http://library.cuhk.edu.hk/record=b5893893.
Full textAbstract:
Zhang, Yin.<br>Thesis submitted in: December 2008.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2009.<br>Includes bibliographical references (leaves 56-60).<br>Abstracts in English and Chinese.<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Telecommunications network hierarchy --- p.2<br>Chapter 1.2 --- PON architectures for access networks --- p.4<br>Chapter 1.2.1 --- TDM-PON --- p.5<br>Chapter 1.2.2 --- WDM-PON --- p.7<br>Chapter 1.3 --- Data delivery mode in WDM-PON --- p.8<br>Chapter 1.3.1 --- Point-to-point --- p.8<br>Chapter 1.3.2 --- Broadcast --- p.9<br>Chapter 1.3.3 --- Multicast --- p.10<br>Chapter 1.4 --- Motivation of this thesis --- p.10<br>Chapter 1.5 --- Outline of this thesis --- p.13<br>Chapter Chapter 2 --- Previous Multicast Architectures in WDM-PON --- p.14<br>Chapter 2.1 --- Introduction --- p.15<br>Chapter 2.2 --- Previous WDM-PON architectures with multicast capability --- p.15<br>Chapter 2.2.1 --- Subcarrier multiplexing --- p.16<br>Chapter 2.2.2 --- All-optical based multicast enabled architecture --- p.18<br>Chapter 2.3 --- Summary --- p.21<br>Chapter Chapter 3 --- A Multicast enabled WDM-PON Architecture Using ASK-DPSK Orthogonal Modulation --- p.23<br>Chapter 3.1 --- Introduction --- p.24<br>Chapter 3.2 --- System architecture --- p.25<br>Chapter 3.3 --- Experimental Demonstration --- p.27<br>Chapter 3.4 --- Discussion --- p.31<br>Chapter 3.5 --- Summary --- p.36<br>Chapter Chapter 4 --- A WG filtering and its suppression in quaternary ASK-DPSK based multicast enabled WDM-PON --- p.37<br>Chapter 4.1 --- Introduction --- p.38<br>Chapter 4.2 --- Principle of narrowband filtering --- p.38<br>Chapter 4.3 --- Simulation model --- p.40<br>Chapter 4.4 --- Simulation results and discussion --- p.42<br>Chapter 4.4.1 --- Different extinction ratios --- p.43<br>Chapter 4.4.2 --- Different AWG filter shape and bandwidth --- p.47<br>Chapter 4.5 --- Summary --- p.50<br>Chapter Chapter 5 --- Summary and Future Works --- p.51<br>Chapter 5.1 --- Summary of the thesis --- p.52<br>Chapter 5.2 --- Future works --- p.53<br>List of Publications --- p.55<br>BIBLIOGRAPHY --- p.56
41
"Study of architectures and protection schemes for high-speed WDM-based passive optical access networks utilizing centralized light sources for colorless optical network units." 2006. http://library.cuhk.edu.hk/record=b5893002.
Full textAbstract:
Zhang Bo.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2006.<br>Includes bibliographical references (leaves 55-59).<br>Abstracts in English and Chinese.<br>Chapter Chapter 1 --- Introduction to Passive Optical Networks --- p.1<br>Chapter 1.1 --- Passive Optical Network (PON) --- p.2<br>Chapter 1.1.1 --- PON architecture --- p.3<br>Chapter 1.1.2 --- PON benefits --- p.4<br>Chapter 1.2 --- The History of PON --- p.4<br>Chapter 1.3 --- WDM-PON --- p.5<br>Chapter 1.4 --- Outline of This Thesis --- p.8<br>Chapter Chapter 2 --- Previous Schemes for Colorless ONU Operation in WDM-PON --- p.9<br>Chapter 2.1 --- Introduction --- p.10<br>Chapter 2.2 --- Previous WDM-PON Architectures for Colorless ONU Operation --- p.10<br>Chapter 2.2.1 --- Spectrum slicing BLS employed at the ONU --- p.11<br>Chapter 2.2.2 --- Centralized broadband light source (BLS) for upstream optical carrier supply --- p.12<br>Chapter 2.2.3 --- Reuse of the downstream carrier at the ONU --- p.17<br>Chapter 2.3 --- Summary --- p.21<br>Chapter Chapter 3 --- WDM-PON with a Centralized Supercontinuum Broadband Light Source for Colorless ONUs --- p.23<br>Chapter 3.1 --- Introduction --- p.24<br>Chapter 3.1.1 --- Introduction to Supercontinuum Generation --- p.24<br>Chapter 3.1.2 --- Introduction to Photonic Crystal Fibers --- p.25<br>Chapter 3.1.3 --- Supercontinuum Generation in a Photonic Crystal Fiber --- p.27<br>Chapter 3.2 --- WDM-PON with Centralized Supercontinuum Broadband Light Source --- p.27<br>Chapter 3.2.1 --- Motivation --- p.27<br>Chapter 3.2.2 --- Proposed access network --- p.28<br>Chapter 3.2.3 --- Experimental demonstration and results --- p.30<br>Chapter 3.2.4 --- Discussions --- p.32<br>Chapter 3.2.5 --- Conclusion --- p.34<br>Chapter 3.3 --- Broadcast Signal Delivery over a WDM-PON based on Supercontinuum Generation --- p.34<br>Chapter 3.3.1 --- Motivation --- p.34<br>Chapter 3.3.2 --- Proposed network architecture --- p.35<br>Chapter 3.3.3 --- Experiment results and discussions --- p.36<br>Chapter 3.3.4 --- Conclusion --- p.38<br>Chapter 3.4 --- Summary --- p.38<br>Chapter Chapter 4 --- A Survivable WDM-PON with Colorless Optical Network Units --- p.39<br>Chapter 4.1 --- Introduction --- p.40<br>Chapter 4.2 --- Previous Protection Schemes --- p.40<br>Chapter 4.3 --- A Survivable WDM-PON with Centralized BLS --- p.44<br>Chapter 4.3.1 --- Network topology and wavelength assignment --- p.45<br>Chapter 4.3.2 --- Protection operation principles --- p.46<br>Chapter 4.3.3 --- Experimental results --- p.47<br>Chapter 4.4 --- Summary --- p.48<br>Chapter Chapter 5 --- Summary and Future Work --- p.50<br>Chapter 5.1 --- Summary of the Thesis --- p.51<br>Chapter 5.2 --- Future Work --- p.52<br>LIST OF PUBLICATIONS --- p.54<br>REFERENCES --- p.55
42
Haque, Anwar. "Designing Survivable Wavelength Division Multiplexing (WDM) Mesh Networks." Thesis, 2007. http://hdl.handle.net/10012/2760.
Full textAbstract:
This thesis focuses on the survivable routing problem in WDM mesh networks where the objective is to minimize the total number of wavelengths used for establishing working and protection paths in the WDM networks. The past studies for survivable routing suffers from the scalability problem when the number of nodes/links or connection requests grow in the network. In this thesis, a novel path based shared protection framework namely Inter-Group Shared protection (I-GSP) is proposed where the traffic matrix can be divided into multiple protection groups (PGs) based on specific grouping policy. Optimization is performed on these PGs such that sharing of protection wavelengths is considered not only inside a PG, but between the PGs. Simulation results show that I-GSP based integer linear programming model, namely, ILP-II solves the networks in a reasonable amount of time for which a regular integer linear programming formulation, namely, ILP-I becomes computationally intractable. For most of the cases the gap between the optimal solution and the ILP-II ranges between (2-16)%. The proposed ILP-II model yields a scalable solution for the capacity planning in the survivable optical networks based on the proposed I-GSP protection architecture.
43
Kritzinger, Ronnie. "Design and fabrication of long-period fibre gratings and wavelength-selective couplers for wavelength-division multiplexing networks." Thesis, 2012. http://hdl.handle.net/10210/4527.
Full textAbstract:
D.Ing.<br>Optical fibre-based devices (e.g. fibre gratings) play an important role in the optical com- munications and sensing industry. One type of fibre grating, the long-period grating (LPG), is becoming more and more popular as a simple and versatile component for a multitude of applications in optical engineering. The sensitivity of LPGs to various external perturbations and their ability to manipulate selectively light propagating in optical fibres make them well- suited to creating fibre-based devices. LPGs can be used in various applications, for example as gain equalisers for erbium-doped fibre amplifiers, as channel routers in optical add-drop multiplexers and as sensors. LPGs are typically fabricated by exposing photosensitive optical fibre to ultraviolet light. However, a variety of other techniques can be used to fabricate LPGs, including exposure to carbon dioxide (CO2) laser light. Over the years, it has become evident that CO2 laser- induced LPGs exhibit unique properties and features that can be harnessed to develop devices for important applications. It is necessary to understand the physical properties and optical characteristics of CO2 laser-induced LPGs to harness, manipulate and enhance their features. Research has been conducted on the development of an automated fabrication system that produces axially symmetric LPGs in single-mode fibre with a CO2 laser. A detailed study was undertaken on the design of uniform and non-uniform LPGs for wavelength-division multiplexing networks, as well as the characterisation of the CO2 laser beam propagating in the LPG fabrication system. These LPGs have been designed, using either analysis or syn- thesis techniques. The polarisation-dependent loss of the LPGs has also been investigated. Wavelength-selective couplers (WSCs) have been constructed using CO2 laser-induced LPGs and it was shown that these couplers were e®ective but not efficient in routing power to the output port of the tapping fibre. The physical properties, optical transmission characteris- tics, applications and other related issues of CO2 laser-induced LPGs have been investigated and satisfactory experimental results have been obtained. Areas for potential future research concerning CO2 laser-induced LPGs have been identified and discussed.
44
Mutsvangwa, Andrew. "Energy-efficient PLIA-RWA algorithms for transparent optical networks." Thesis, 2017. http://hdl.handle.net/10321/2470.
Full textAbstract:
Submitted in fulfilment of the requirements of the D.Tech.: Electrical Engineering, Durban University of Technology, 2017.<br>The tremendous growth in the volume of telecommunication traffic has undoubtedly triggered an unprecedented information revolution. The emergence of high-speed and bandwidth-hungry applications and services such as high-definition television (HDTV), the internet and online interactive media has forced the telecommunication industry to come up with ingenious and innovative ideas to match the challenges. With the coming of age of purposeful advances in Wavelength Division Multiplexing (WDM) technology, it is inherently practicany possible to deploy ultra-high speed all-optical networks to meet the ever-increasing demand for modern telecommunication services. All-optical networks are capable of transmitting data signals entirely in the optical domain from source to destination, and thus eliminate the incorporation of the often bulky and high-energy consuming optical to-electrical-to-optical (OEO) converters at intermediate nodes. Predictably, all-optical networks consume appreciably low energy as compared to their opaque and translucent counterparts. This low energy consumption results in lower carbon footprint of these networks, and thus a significant reduction in the greenhouse gases (GHGs) emission. In addition, transparent optical networks bring along other additional and favourable rewards such as high bit-rates and overall protocol transparency. Bearing in mind the aforementioned benefits of transparent optical networks, it is vital to point out that there are significant setbacks that accompany these otherwise glamourous rewards. Since OEO conversions are eliminated at intermediate nodes in all-optical networks, the quality of the transmitted signal from source to destination may be severely degraded mainly due to the cumulative effect of physical-layer impairments induced by the passage through the optical fibres and associated network components. It is therefore essential to come up with routing schemes that effectively take into consideration the signal degrading effects of physical -layer impairments so as to safeguard the integrity and health of transmitted signals, and eventually lower blocking probabilities. Furthermore, innovative approaches need to be put in place so as to
strike a delicate balance between reduced energy consumption in transparent networks and the quality of transmitted signals. In addition, the incorporation of renewable energy sources in the powering of network devices appears to gain prominence in the design and operation of the next-generation optical networks.
The work presented in this dissertation broadly focuses on physical-layer impairment aware routing and wavelength assignment algorithms (PLIA-RWA) that attempt to: (i) achieve a
sufficiently high quality of transmission by lowering the blocking probability, and (ii) reduce the energy consumption in the optical networks. Our key contributions of this study may be summarized as follows:
Design and development of a Q-factor estimation tool.
Formulation, evaluation and validation of a QoT-based analytical model that computes blocking probabilities.
Proposal and development of IA-RWA algorithms and comparison with established ones. Design and development of energy-efficient RWA schemes for dynamic optical networks.<br>D
45
"Multicast protection and energy efficient traffic grooming in optical wavelength routing networks." 2010. http://library.cuhk.edu.hk/record=b5894415.
Full textAbstract:
Zhang, Shuqiang.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2010.<br>Includes bibliographical references (p. 74-80).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>摘要 --- p.iv<br>Acknowledgements --- p.v<br>Table of Contents --- p.vi<br>Chapter Chapter 1 --- Background --- p.1<br>Chapter 1.1 --- Routing and Wavelength Assignment --- p.1<br>Chapter 1.2 --- Survivability in Optical Networks --- p.3<br>Chapter 1.3 --- Optical Multicasting --- p.4<br>Chapter 1.3.1 --- Routing and Wavelength Assignment of Optical Multicast --- p.5<br>Chapter 1.3.2 --- Current Research Topics about Optical Multicast --- p.8<br>Chapter 1.4 --- Traffic Grooming --- p.10<br>Chapter 1.4.1 --- Static Traffic Grooming --- p.11<br>Chapter 1.4.2 --- Dynamic Traffic Grooming --- p.13<br>Chapter 1.5 --- Contributions --- p.15<br>Chapter 1.5.1 --- Multicast Protection with Scheduled Traffic Model --- p.15<br>Chapter 1.5.2 --- Energy Efficient Time-Aware Traffic Grooming --- p.16<br>Chapter 1.6 --- Organization of Thesis --- p.18<br>Chapter Chapter 2 --- Multicast Protection in WDM Optical Network with Scheduled Traffic --- p.19<br>Chapter 2.1 --- Introduction --- p.19<br>Chapter 2.2 --- Multicast Protection under FSTM --- p.22<br>Chapter 2.3 --- Illustrative Examples --- p.28<br>Chapter 2.4 --- Two-Step Optimization under SSTM --- p.37<br>Chapter 2.5 --- Summary --- p.40<br>Chapter Chapter 3 --- Energy Efficient Time-Aware Traffic Grooming in Wavelength Routing Networks --- p.41<br>Chapter 3.1 --- Introduction --- p.41<br>Chapter 3.2 --- Energy consumption model --- p.43<br>Chapter 3.3 --- Static Traffic Grooming with Time awareness --- p.44<br>Chapter 3.3.1 --- Scheduled Traffic Model for Traffic Grooming --- p.44<br>Chapter 3.3.2 --- ILP Formulation --- p.44<br>Chapter 3.3.3 --- Illustrative Numerical Example --- p.48<br>Chapter 3.4 --- Dynamic Traffic Grooming with Time Awareness --- p.49<br>Chapter 3.4.1 --- Time-Aware Traffic Grooming (TATG) --- p.51<br>Chapter 3.5 --- Simulation Results of Dynamic Traffic Grooming --- p.54<br>Chapter 3.5.1 --- 24-node USNET: --- p.55<br>Chapter 3.5.2 --- 15-node Pacific Bell Network: --- p.59<br>Chapter 3.5.3 --- 14-node NSFNET: --- p.63<br>Chapter 3.5.4 --- Alternative Configuration of Simulation Parameters: --- p.67<br>Chapter 3.6 --- Summary --- p.71<br>Chapter Chapter 4 --- Conclusions and Future Work --- p.72<br>Chapter 4.1 --- Conclusions --- p.72<br>Chapter 4.2 --- Future Work --- p.73<br>Bibliography --- p.74<br>Publications during M.Phil Study --- p.80
46
"Novel techniques for Rayleigh noise suppression and multicast transmission in wavelength division multiplexed passive optical networks." Thesis, 2011. http://library.cuhk.edu.hk/record=b6075193.
Full textAbstract:
Centralized light source (CLS) at the central office is an attractive solution for low-cost implementation of WDM-PON, as it eliminates the need of wavelength-specific transmitters and wavelength management at the optical network units (ONU). CLS can be realized by either a carrier-distributed scheme or a remodulation scheme. In both schemes, however, the upstream signal is susceptible to the interferometric crosstalk induced by the beating between the upstream signal and the back-reflected light due to the intrinsic Rayleigh Backscattering (RB), both of which are of the same wavelength. We propose and demonstrate a simple and novel scheme to suppress the RB noise in the carrier-distributed WDM-PON. Differential phase-shift keying (DPSK) is used as the upstream modulation format and the destructive port of the delay-interferometer (DI) is employed to demodulate the upstream DPSK signal. As the spectrum of RB towards the OLT is narrow due to the very narrow spectrum of the distributed carrier, the RB noise can be considerably rejected by the notch filter-like destructive port of the DI at the OLT, which is used simultaneously to demodulate the upstream DPSK signal. The scheme can also be extended to the application in the remodulation-based WDM-PON, as long as the downstream signal has a narrow spectrum (i.e. via reducing downstream modulation depth). A unique feature of the DPSK signal with reduced modulation depth (RMD-DPSK) is that it can be demodulated by DI's destructive port without extinction ratio (ER) degradation, whereas the demodulated signal from DI's destructive port has a very low ER and can be used as the source for upstream remodulation. We also proposed a novel offset-Manchester coding to suppress Rayleigh noise in electrical domain via a postdetection high-pass filter.<br>Foreseeing the rapidly growing demand for multimedia services and the trend of service convergence, the penetration of optical fiber in access network is an ultimate solution to break the last-mile bottleneck imposed by the 100-year-old copper network. One of the most promising solutions to realize optical access is the passive optical network (PON), in which the network infrastructure is shared by many subscribers and has no active elements between the central office and the customer. Thus a PON requires neither electrical power nor active management, leading to effective reduction in operational expenses. Time-division-multiplexed passive optical networks (TDM-PONs) such as Ethernet PON (EPON) and Gigabit PON (GPON) are being widely deployed in current fiber-based access networks for providing broadband access, offering triple-play services including video, data and voice. In the near future, wavelength-division-multiplexed passive optical network (WDM-PON) can be the enabler of the next-generation optical broadband access that requires large dedicated and symmetric bandwidth, data privacy, and upgrade flexibility. TDM-PONs also can benefit from WDM technologies for capacity upgrade.<br>With more diverse multimedia and data services available for broadband access, the access network has to be flexible enough to cope with various data or video delivery such as broadcast/multicast services, in addition to the point-to-point traffic. Multicast is more attractive, compared to broadcast, as it allows selective control of the connection for each subscriber individually. Multicast can be easily realized in TDM-PONs as it employs power-splitting at the remote node (RN). However, it is more challenging in WDM-PONs, due to the dedicated connection between the optical line terminal (OLT) and each ONU. Many studies have been carried out to solve this problem. The prior schemes either need relatively complicated multicast control and/or cannot support future proof 10-Gb/s symmetric point-to-point (PtP) transmission. We proposed a novel multicast control scheme for a WDM-PON with 10-Gb/s symmetric bit rate. The multicast data encoded in DPSK format is superimposed onto all PtP channels modulated in inverse return-to-zero format. With an athermal Dr being used at the ONU to demodulate the DPSK signal, the multicast data can be effectively disabled by slight detuning the laser wavelength at OLT, which has negligible effect on the PtP data. The proposed scheme differs from all the previous schemes in that, the multicast control is realized via the inherent wavelength management of WDM systems, rather than via any other additional adjustment such as ER, synchronization, and polarization. v<br>Xu, Jing.<br>Adviser: Lian-Kuan Chen.<br>Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: .<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references.<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Abstract also in Chinese.
47
Krishnaswamy, Rajesh M. "Algorithms For Routing, Wavelength Assignment And Topology Design In Optical Networks." Thesis, 1998. http://etd.iisc.ernet.in/handle/2005/1557.
Full text
48
Heidarialamdarloo, Jamshid. "Advanced communications with plastic optical fibers." Doctoral thesis, 2018. http://hdl.handle.net/10773/25881.
Full textAbstract:
Nowadays, fiber to the Home/Curb/Building/Cabinet (FTTx) services that interconnect homes with a standard glass optical fiber cables to the core/access optical networks have brought the optical fiber at the doorsteps of our homes. However, the last few miles in home access network is still based on the limited bandwidth electronic component which supports by the cooper wires e.g. Cat-5, 6. The rapid growth of personal smart/mobile electronic devices with new developments such as video on demand, High Definition (HD)
and three-Dimension (3D) television (TV), cloud computing, video conferences, etc. has been proposed new challenges for the next generation high bandwidth demand required for subscribers in home access network. In order to meet the more demanding expectations of the end user with new developments, it is necessary to improve the physical infrastructure of the existing in home networks in order to obtain the best ratio between quality of service and price of implementation. Plastic optical fibers (POFs) are point out as a promising transmission medium for short-range communication in compare to the “classic” single/multimode glass optical fibers and current cooper wire
technology developments. The main advantages of POF are its easy to install, easy splicing and the possibility of using low cost optical transceivers, capability of being robust, and immunity to electromagnetic noise interference. However, the benefits of large-core POFs come at the expense of a less bandwidth and a higher attenuation than silica-based solution. The main objective of this doctoral dissertation is to explore the possibilities and develop low cost, short reach, high data rate POF-links for in home
networks applications. This thesis investigates the use of multilevel modulation in particular, pulse amplitude modulation (PAM in combination of the receiver equalizer in order to overcome the bandwidth limitations of the graded index POFs. The possibility of the using multiple channels over a single fiber to increase the capacity of POF systems using commercially available multimode components is also analyzed in this dissertation. Moreover, a low cost Digitised radio signal over plastic fiber system is proposed and evaluated to deliver digital baseband data for wireline and wireless users in home access network. The deployment will be specified in terms of performance, maximum rates and any degradation that might appear in the network. Furthermore, the possibilities of the microstructured fibers in telecommunication application will be studied with main emphasis on their structural design. The photonic crystal fibers made of different highly nonlinear materials with different structures are optimized to achieve ultra-flat dispersion, high nonlinearity and low confinement loss over a broad range of wavelengths in the perspective of their usage in telecommunication applications.<br>Hoje em dia, a possibilidade de a fibra óptica até casa (FTTH) para a transmissão simultânea de diferentes serviços como internet, telefone, televisão digital é uma realidade. No entanto, para satisfazer as expectativas mais exigentes do usuário final com novos desenvolvimentos, tais como vídeo sob demanda, de alta definição (HD) e tridimensional (3D) de televisão (TV), computação em nuvem, vídeo conferências, etc., é necessário melhorar a infra-estrutura física da existente em redes domésticas, a fim de obter a melhor relação entre a qualidade do serviço e preço de implementação. Fibra óptica de plástico (POF) é considerada um meio de transmissão promissor para
comunicações de curto alcance, queando comparadas com a clássica fibra óptica de silica (tanto monomodo como multimodo) e com as tecnologias atuais baseadas em fio de cobre. As principais vantagens da POF encontramse na sua facilidade de instalação e conecção, possibilidade de uso de fontes e detectores de baixo custo, robustez e imunidade electromagnética. No entanto, o uso da POF de elevado diâmetro têm também desvantagens uma vez que esta oferece uma menor largura de banda e uma atenuação superior à
fibra de sílica convêncional. Esta dissertação de doutoramento tem como principal objetivo explorar as possibilidades de desemvolvimento de componentes de baixo custo baseados em POF para redes de curto alcance, com alta taxa de transmisssão de dados. Esta tese investiga a utilização de vários formatos de modulação combinados
com equalizador e receptor, de maneira a superar as limitações de largura de banda em sistemas de comunicação óptica de curto alcance. Em particular, a modulação em amplitude de impulso (PAM) é proposta e investigada a fim de aumentar a capacidade de tais sistemas. Além disso, a possibilidade de usar múltiplos canais, utilizando uma única fibra óptica, também conhecido por multiplexagem por divisão de comprimento de onda (WDM), será analisada neste trabalho. A viabilidade das tecnologias de redes de acesso tanto a nível individual como em sistemas WDM serão analisadas usando componentes multimodo disponíveis comercialmente. A implementação será especificada
em termos de desempenho tanto a nível da taxas máximas de transmissão, bem como na degradação do sinal que possa ocorrer na rede. No capitulo 5 desta dissertação é apresentado sistema de radio através de fibra. Este tipo de sistemas permite a simplificação das estações base providenciando também uma elevada manutenção de custos. O principal objectivo deste estudo prende-se com a investigação do impacto da amostragem na preformance de digitalização de rádio através de fibra e também como a introdução de fibra óptica de plástico pode afetar o sistema. Além disso, a possibilidade da aplicação de fibras óticas microestruturadas em redes de telecomunicações serão estudadas com ênfase principal na sua concepção estrutural. As fibras de cristal fotônico feitas de diferentes materiais altamente não-lineares com diferentes estruturas serão otimizadas a fim de alcançar uma dispersão ultra-plana, elevada não linearidade e baixa perda de confinamento em uma vasta gama espectral, na perspectiva de seu uso em aplicações de telecomunicações.<br>Programa Doutoral em Engenharia Eletrotécnica
49
Taebi, Harandi Sareh. "Integrated Optoelectronic Devices and System Limitations for WDM Passive Optical Networks." Thesis, 2012. http://hdl.handle.net/10012/7048.
Full textAbstract:
This thesis puts focus on the technological challenges for Wavelength Division Multiplexed Passive Optical Network (WDM-PON) implementation, and presents novel semiconductor optical devices for deployment at the optical network unit (ONU). The first-ever reported L-band Reflective semiconductor optical amplifier (RSOA) is presented based on InP-base material. A theoretical model is developed to estimate the optical gain and the saturation power of this device compared to a conventional SOA. Experiments on this device design show long-range telecom wavelength operation, with polarization-independent gain of greater than 20 dB, and low saturation output power of 0 dBm suitable for PON applications.
Next, the effect of the amplified spontaneous emission noise of RSOA devices on WDM-PON system is investigated. It is shown through theoretical modeling and simulations that the RSOA noise combined with receiver noise statistics increase probability of error, and induce considerable power penalties to the WDM-PON system. By improving the coupling efficiencies, and by distributing more current flow to the input of these devices, steps can be taken to improve device noise characteristics.
Further, in spectrally-spliced WDM-PONs deploying RSOAs, the effect of AWG filter shape on system performance is investigated. Simulation modeling and experiments show that deployment of Flat-band AWGs is critical for reducing the probability of error caused by AWG spectral shape filtering. Flat-band athermal AWGs in comparison to Gaussin-shape counterparts satisfy the maximum acceptable error probability requirements, and reduce the power penalty associated with filtering effect. In addition, detuning between two AWG center wavelengths impose further power penalties to the WDM-PON system.
In the last section of this thesis, motivated by RSOA device system limitations, a novel injection-locked Fabry-Perot (IL-FP) device is presented which consists of a gain section monolithically integrated with a phase section. The gain section provides locking of one FP mode to a seed source wavelength, while the phase modulator allows for adjusting the wavelength of the internal modes by tuning bias current to maintain mode-locking. This device counters any mode drifts caused by temperature variations, and allows for cooler-less operation over a wide range of currents.
The devices and the performance metrics subsequently allow for a hybrid integration platform on a silicon substrate and integrate many functionalities like reflective modulator with thin film dielectric filter and receiver on a single chip for deployment at the user-end of future-proof low cost WDM-PONs.
50
Sousa, Artur Neves e. "Transmission techniques for high rates in optical fiber and alternative media." Doctoral thesis, 2020. http://hdl.handle.net/10773/31994.
Full textAbstract:
The increase in services provided by mobile network operators, as well as
traffic over wireless networks (WiFi), has intensely exploited the available radio
frequency (RF) spectrum. The fixed telecommunications network that connects
radio antennas, Wi-Fi access points, or other technologies (eg, Wimax)
supports new services that require higher transmission rates and connections,
such as cloud computing, HDTV, Internet of Things (IoT) or Machine-to-
Machine (M2M) communication. Silicon single-mode fiber optic (SMF) has
been chosen as a means of transporting data on the fixed network as it offers
higher bandwidths and transmission rates.
In a desirable ubiquitous and transparent optical network context, there are still
several bottlenecks in the network structure, whether due to the characteristics
of SMF or economical from a cost/return perspective. Besides, current access
networks based on SMF cable or RF connections are subject to interruptions
and should therefore be able to provide alternative transmission paths.
On the other hand, the expected increase in information traffic in the near
future leads to the establishment of new spectral allocation protocols for SMF.
The ITU-T G.989 standard thus emerges to promote next-generation (NGPON2)
networks that seek to exploit the spectrum available in SMFs through
point-to-multipoint Wavelength Division Multiplexing (WDM) networks as well
as in UDWDM (Ultra-Dense WDM) in a point to point configuration, addressed
to the end-user.
In this context, plastic optical fiber (POF) appears as an alternative
transmission medium to the SMF and promising in the short-range network.
The implementation of the POF extends to the telecommunications operators'
access network, the residential / building telecommunications network,
transport vehicles or the rapid re-establishment of communications in accidentprone
optical networks. Free Space Optical Transmission (FSO) is also a
promising means of communication and alternative for short-range RF or SMF
connections. FSO connections can be applied to the telecom operator's
access network, standby connections between GSM antennas, the connection
between an institution's buildings, point-to-multipoint wireless communications,
or the quick re-establishment of a cable optical device accidentally interrupted.
Thus, the POF and FSO transmission media will be studied here, exploring
new spectral limits and transmission capabilities involving GPON and NGPON2
network protocols. Coherent reception and data retrieval through
software-defined receivers for real-time digital signal processing will be
explored.<br>O aumento dos serviços prestados pelas operadoras de rede móvel, assim
como do tráfego nas redes-sem-fios (WiFi) têm explorado intensamente o
espectro de radiofrequência (RF) disponível. A rede fixa de telecomunicações
que conecta as antenas rádio, pontos de acesso WiFi ou outras tecnologias
(ex. Wimax), suporta novos serviços que exigem maiores taxas de
transmissão e conexões, como por exemplo a computação na nuvem, HDTV,
Internet das Coisas (IoT) ou a comunicações de Máquina-a-Máquina (M2M). A
fibra óptica monomodo em silício (SMF) tem sido a escolhida como o meio de
transporte de dados na rede fixa, uma vez que disponibiliza maiores larguras
de banda e taxas de transmissão.
Num contexto desejável de rede óptica ubíqua e transparente, subsistem
variados estrangulamentos na estrutura da rede, sejam devido às
características da SMF, sejam económicos numa perspectiva de
custo/retorno. Além disso, as actuais redes de acesso, baseadas em cabos de
SMF ou em ligações RF, estão sujeitas a interrupções e, portanto, devem
poder contemplar caminhos de transmissão alternativos.
Por outro lado, o aumento esperado no tráfego de informações no futuro
próximo leva ao estabelecimento de novos protocolos de alocação espectral
para a SMF. O padrão ITU-T G.989 surge, assim, para promover as redes de
próxima geração (NG-PON2) que procuram explorar o espectro disponível em
SMFs através de redes WDM (Wavelength Division Multiplexing) pontomultiponto,
bem como através de redes em UDWDM (Ultra-Dense WDM)
numa configuração ponto a ponto, endereçado ao utilizador final.
Neste contexto, a fibra óptica plástica (POF) surge como um meio de
transmissão alternativo à SMF e promissor na rede de curto alcance. A
implementação da POF estende-se à rede de acesso das operadoras de
telecomunicações, à rede de telecomunicações residencial/predial, aos
veículos de transporte ou no rápido restabelecimento das comunicações em
redes ópticas propensas a acidentes. A transmissão óptica de espaço livre
(FSO) também é um meio promissor de comunicação e uma alternativa nas
conexões em RF ou SMF de curto alcance. As conexões FSO podem ser
aplicadas à rede de acesso do operador de telecomunicações, às conexões
em reserva entre as antenas dos operadores móveis, à conexão entre os
edifícios de uma instituição, às comunicações sem fio ponto-multiponto ou no
rápido restabelecimento de um cabo óptico interrompido acidentalmente.
Assim, os meios de transmissão POF e FSO serão aqui estudados,
explorando-se novos limites espectrais e capacidades de transmissão
envolvendo os protocolos de redes GPON e NG-PON2. Serão exploradas a
recepção coerente e a recuperação de dados através de receptores definidos
por software, para o processamento de sinais digitais em tempo real.<br>Programa Doutoral em Engenharia Eletrotécnica