To see the other types of publications on this topic, follow the link: All-optical networks.
Dissertations / Theses on the topic 'All-optical networks'
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 'All-optical networks.'
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
Tariq, Sana. "Inside all-optical networks /." Online version of thesis, 2009. http://hdl.handle.net/1850/10960.
Full text
2
Ito, Christopher Joshua Shiro. "All-optical 3R regeneration for agile all-photonic networks." Thesis, Kingston, Ont. : [s.n.], 2007. http://hdl.handle.net/1974/508.
Full text
3
Atieh, Ahmad K. "Exploiting solitons in all-optical networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28325.pdf.
Full text
4
Barry, Richard A. "Wavelength routing for all-optical networks." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12508.
Full textAbstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.Includes bibliographical references (p. 171-176).
by Richard A. Barry.
Ph.D.
5
Rawat, Anuj. "Multicasting in all-optical WDM networks." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8763.
Full textAbstract:
Thesis (Ph. D.) -- University of Maryland, College Park, 2008.Thesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
6
Sathyan, Saju. "All Optical Switching Architectures." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-253.
Full textAbstract:
In communication systems, the need for high bandwidth interconnects and
efficient distribution of large amount of data is very essential. This thesis work
addresses all-optical packet switching issues in the field of reconfigurable optical
interconnection networks for high performance embedded systems. The recent
research conducted at the Halmstad University, on high performance embedded
systems, focuses on the optical interconnection techniques to achieve ultra high
throughputs and reconfigurability at the system level.
Recent research in the field of optical interconnection networks for applications
like switches and routers for data and telecommunication industry and parallel
computing architectures for embedded signal processing use optical to electrical
conversion to switch packets. This conversion scales down the enormous bandwidth
capacity of the optical communication channels to electronic processing rates. To
maintain the high throughputs all over the interconnection networks, the optical
packets need to be maintained in optical state and switched to different part of the
interconnection network. To achieve this goal, all-optical packet switching
architectures are studied. The study is concluded with a positive outlook towards alloptical
switching technologies, and it will play a very important role in the near
future in the field of optical communication, telecommunication and embedded
systems.
7
Vali, Sichani Atousa. "Signaling protocols for survivable all-optical networks." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/29375.
Full textAbstract:
Survivable mechanisms, including fault localization and connection restoration, are achieved by means of electronically analyzing overhead bits in opaque optical networks. However, unlike opaque networks, transparent all-optical networks are unable to examine signal quality at transponders. Consequently, locating and isolating failures and attacks (intentional failures) in transparent optical networks are much harder than in opaque networks. Likewise, connection restoration and path rectification are more complex. Therefore, previously defined survivable terminologies, models, and techniques should be evolved and re-designed with respect to the dissimilarities to be applicable to all-optical networks.
Accordingly, this thesis proposes several fault detection protocols, including Fault Localization Signaling Protocol, Rolling-back Signaling Protocol, and Limited-perimeter Vector Matching Protocol, and a number of connection restoration and re-routing techniques, such as Open Link Restoration Protocol, Minimum Weighted-path Restoration Protocol, and Signaling Nested Reservation Protocol, which are feasible in all-optical communication networks.
The proposed protocols are all implemented by signaling in the supervisory channels of the overlay model. Since these protocols use controlling signals only as triggering signs, they are not involved in substantial processes and delays. As a result, they are compatible to high-speed all-optical networks. However, the signaling mechanisms embedded in these protocols utilize additional bandwidth from the control network.
8
Lam, Tony Lai Ho. "Designing a testbed for all-optical networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0012/MQ52592.pdf.
Full text
9
Benlachtar, Yannis. "Advanced performance monitoring in all-optical networks." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1444537/.
Full textAbstract:
This thesis investigates advanced optical performance monitoring approaches for future all-optical networks using the synchronous sampling technique. This allows for improved signal quality estimation, fault management and resource allocation through improved control of transmission at the physical layer level. Because of the increased transparency in next generation networks, it is not possible to verify the quality of the signal at each node because of the limited number of optical-electrical-optical conversions, and therefore new non-intrusive mechanisms to achieve signal quality monitoring are needed. The synchronous sampling technique can be deployed to estimate the bit error rate, considered an important quality measure, and hence can be utilised to certify service level agreements between operators and customers. This method also has fault identification capabilities by analysing the shapes of the obtained histograms. Each impairment affects the histogram in a specific way, giving it a unique shape that can be used for root cause analysis. However, chromatic dispersion and polarisation mode dispersion (PMD) can have similar signatures on the histograms obtained at decision times. A novel technique to unambiguously discriminate between these two sources of degradation is proposed in this work. It consists of varying the decision times so that sampling also occurs at both edges of the eye diagram. This approach is referred to as three-section eye sampling technique. In addition, it is shown that this method can be used to accurately assess first order polarisation mode dispersion and can simultaneously estimate the differential group delay (DGD) and the power splitting ratio between the two states of polarisation. Since synchronous sampling is employed, the effect of PMD on the sampling times is also investigated. For the first time, closed form relationship between the shift in sampling time, the DGD and the power splitting ratio between the polarisation states is obtained. Three types of high-Q filter based clock recovery circuits are considered: without pre-processing circuits that can be used for RZ format and with an edge detector or a squarer pre-processing circuits suitable for NRZ format. Moreover, this technique can be used to monitor chromatic dispersion and a large monitoring range of more than 1750ps/nm is experimentally demonstrated at 10Gbit/s. Since it can monitor PMD and dispersion, this method can be deployed to control dynamic PMD or dispersion compensators. Furthermore, this technique offers easy and quick inline eye mask testing and timing jitter assessment.
10
Feffer, Antonia Lynn. "Comprehensive security strategy for all-optical networks." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99866.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 107-109).
Optical networking is a powerful means of communication in modem times of high bandwidth demands and high data speeds. While developments in optical networking continue to progress, however, the security implications they create have not yet caught up. In this thesis, we characterize a selection of damaging attacks against optical networks. By providing a detailed description of the attacks, we are also able to better understand their effects across the different layers of the network model. We also propose the current best practices for sensing and detection of these attacks when they occur, as well as mitigation techniques to limit the damage they incur. The attacks are not fully eliminated, however, and so we also identify remaining vulnerabilities these attacks can exploit. After characterizing the attacks, we propose a method for diagnosing attacks as they occur within a network given the analysis we have conducted. We also propose an algorithm for diagnosing attacks, as well as a monitoring system framework that relies on the establishment of autonomous zones of the network in order to efficiently limit damage and quarantine problem areas from the rest of the healthy network. This framework can be applied to a wide variety of network set-ups and topologies, with the ability to customize it to fit the needs of the system.
by Antonia Lynn Feffer.
S.M.
11
Rofoee, Bijan Rahimzadeh. "The road to all programmable optical networks." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685006.
Full textAbstract:
In the era of everything on the cloud, intern et of things and big data, the dramatic traffic growth and the evolution of today's telecommunications services are affecting the overall optical network infrastructure and usage, Whilst Wavelength Division Multiplexing systems struggle to cope with bandwidth requirements, Flexi-Grid and Space Division Multiplexing technologies emerge and promise to deliver the required capacity gain, Software defined networking on the other hand has been introduced to facilitate management and control of the network resources, All these efforts take place when the static nature of network installation and operation affects network cost and energy consumption and limits network flexibility and scalability, This is whilst building a network featuring ultra-low latency, power efficiency, flexibility, and enormous capacity has become a necessity, This thesis will explain how a number of programmable optical networking testbeds for advanced sub/super lambda optical transports were designed and developed, which were additionally enhanced with innovative controller platforms, These demonstrator networks and testbeds introduce a range of technologies and approaches to incorporate and inject programmability into optical networking infrastructure, Forwarding programmability, network hardware programmability exploiting FPGAs, and infrastructure programmability using reconfigurable optical backplane, are the main enabling technologies, which come together in various architectures and under different control planes (GMPLS, SDN) to demonstrate the benefits of added flexibility and programmability for advanced optical communications. The experiments and efforts reported in this thesis include software/hardware development, optoelectronics, network designs, and simulation studies, which are categorised and introduced subsequently and in various chapters as the work evolves towards the All Programmable Optical Network.
12
Subramaniam, Suresh. "All-optical networks with sparse wavelength conversion /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/6032.
Full text
13
Tian, Wenhong Mitchell Kenneth H. "Stochastic modeling and dimensioning in all-optical networks." Diss., UMK access, 2005.
Find full textAbstract:
Thesis (M.S.)--School of Computing and Engineering. University of Missouri--Kansas City, 2005."A thesis in computer science." Typescript. Advisor: Ken Mitchell. Vita. Title from "catalog record" of the print edition Description based on contents viewed June 27, 2006. Includes bibliographical references (leaves 49-52). Online version of the print edition.
14
De, Vega Rodrigo Miguel. "Modeling future all-optical networks without buffering capabilities." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210455.
Full textAbstract:
In this thesis we provide a model for a bufferless optical burst switching (OBS) and an optical packet switching (OPS) network. The thesis is divided in three parts. In the first part we introduce the basic functionality and structure of OBS and OPS networks. We identify the blocking probability as the main performance parameter of interest.
In the second part we study the statistical properties of the traffic that will likely run through these networks. We use for this purpose a set of traffic traces obtained from the Universidad Politécnica de Catalunya. Our conclusion is that traffic entering the optical domain in future OBS/OPS networks will be long-range dependent (LRD).
In the third part we present the model for bufferless OBS/OPS networks. This model takes into account the results from the second part of the thesis concerning the LRD nature of traffic. It also takes into account specific issues concerning the functionality of a typical bufferless packet-switching network. The resulting model presents scalability problems, so we propose an approximative method to compute the blocking probability from it. We empirically evaluate the accuracy of this method, as well as its scalability.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
15
Yuan, Xiaochun, and 袁小春. "Routing protocols in all-optical packet switched networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243885.
Full text
16
Rejeb, Ridha. "Fault and attack management in all-optical networks." Thesis, University of Warwick, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425517.
Full text
17
Jamro, Muhammad Yousif. "Wavelength conversion technologies for all-optical WDM networks." Thesis, Manchester Metropolitan University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341057.
Full text
18
Baker, Carol. "Operation, administration and maintenance in all optical networks." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5240.
Full textAbstract:
Includes bibliographical references.The phenomenal growth rate of Internet traffic as well as the increasing demand for high bandwidth services such as video-on-demand (VoD), high definition TV (HDTV), video-conferencing etc., have created a new networking environment in which flexibility, scalability and high bandwidth capacity are of utmost importance. All Optical Networks has emerged as a promising technology to deliver the high capacity demands of current and envisaged future applications.
19
Borrero-Molina, Armando. "Simulation of all-optical networks with deflection routing." Versailles-St Quentin en Yvelines, 2004. http://www.theses.fr/2004VERS0021.
Full textAbstract:
Dans ce travail de recherche, nous avons développé un simulateur pour les réseaux tout-optique, qui utilise une stratégie de routage par déflexion. La topologie choisie dans notre modèle est un réseau en grille 2D, principalement en raison de la simplicité pour sa mise en forme et de son approche à une topologie réelle. La taille du réseau modélisé est 10 x 10, en prenant en considération que notre réseau est du type "Core Network". Nous avons prouvé un algorithme distribué qui déflecte le plus petit nombre de paquets dans chaque noeud du réseau. Nous l'avons appelé Algorithme de Déflexion Minimal et nous avons évalué ses performances dans un réseau tout optique. Chaque noeud essaie d'envoyer les paquets à leur route optimale, au plus court chemin à leur destination, le chemin avec le nombre minimum de deflexions. Nous avons développé aussi un autre algorithme de routage par deflection qui essaye de faire, une minimisation globale sur tout le parcours des paquets, et nous l'avons appelé Routage Escalier. Nous avons mis en parallèle notre simulateur et nous avons mis en place un simulateur distribué afin d'obtenir de meilleurs temps d'exécution, pour exécuter des problèmes plus grands. Nous avons aussi développé quelques Contrôles d'Access aux réseaux, dans le but de contrôler le flux d'entrée des paquets au réseau, améliorer les performances du temps de transport et contrôler la charge pour offrire diverses Qualités de ServiceIn this work, we hâve developed an aU-optical networks simulator, that uses a deflection routing method. The chosen topology for our rnodel is a 2D grid network, mainly because of its simplicity of implementation and its approach to a real topology. The size of thé modèle network is 10x10. We hâve considered this size, taking in considération that our network is of thé type "Core Network". We hâve proved a distributed algorithm that deflects thé smaltest number of customers in every node of thé net. We hâve called it Minime Deflection Algorithm and we hâve evaluated its performances in an all-optical network. Every node attempts to send thé packets to theirs optimal routes, to thé shortest hop path to their destination, thé path with thé minimum number of deflections. We hâve also developed another deflection routing algorithm that does a gtobal minimization on thé packets route, and we hâve called it, Scate Routing Algorithm. We hâve paralleled our simulator and we hâve imptemented a distributed simulator in order to obtain better exécution times, with thé intention of decrease thé exécution time and to run bigger problems, this is, to exécute thé simulator with bigger values of thé arrivai rate or bigger simulation times, bigger number of hops. We hâve also developed some Network Access Controls, in order to central thé input networks flow, to central thé load to offer diverse types of Quality of Service and to improve thé time transport performances
20
Mokhtar, Ahmed. "Routing, switching, and multiaccess in all-optical networks /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/5942.
Full text
21
Yuan, Xiaochun. "Routing protocols in all-optical packet switched networks /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25100725.
Full text
22
Robinson, Bryan S. (Bryan Shawn) 1975. "Semiconductor-based all-optical switching for optical time-division multiplexed networks." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17590.
Full textAbstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.Includes bibliographical references.
All-optical switching will likely be required for future optical networks operating at data rates which exceed electronic processing speeds. Switches utilizing nonlinearities in semiconductor optical amplifiers (SOA) are particularly attractive due to their compact size, low required switching energies, and high potential for integration. In this dissertation we investigate the practical application of such semiconductor-based all-optical switches in next-generation optical networks. We present both theoretical and experimental studies of SOA-based interferometric switches. A detailed numerical model for the dynamic response of an SOA to an intensity-modulated optical signal is described. The model is validated using novel pump-probe techniques to measure the time-domain response of an SOA subject to various levels of saturation. The model is then used to evaluate the performance of three common SOA-based interferometric all-optical switches. The use of SOAs in optical transmission systems has been limited due to the deleterious effects of pattern-dependent gain saturation. We develop a statistical model to study the system impact of variations of the SOA optical gain in response to a random intensity-modulated optical signal. We propose the use of pulse-position modulation (PPM) as a means for mitigating gain saturation effects in SOA-based optical processors. We present techniques for modulation and detection of optical PPM signals at data rates in excess of 100 Gbit/s. We demonstrate demultiplexing, wavelength conversion, and format conversion of optical PPM signals at data rates as high as 80 Gbit/s. Finally, we report on experimental demonstrations of an optical interface for slotted OTDM networks.
(cont.) We implement head-end and transmitter nodes capable of producing fully loaded optical slots at an aggregate network data rate of 112.5 Gbit/s. We demonstrate a fully functional receiver node which utilizes semiconductor-based all-optical logic for synchronization, address processing, and rate conversion.
by Bryan S. Robinson.
Ph.D.
23
Yow, Chee Kim. "Ultrafast semiconductor-based interferometer all-optical switch for future optical networks." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614232.
Full text
24
Zulkifli, Nadiatulhuda. "Dispersion-optimised resource allocation in all-optical networks with heterogeneous optical services." Thesis, University of Essex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504886.
Full textAbstract:
All-optical networks (AON) facilitat~ the transportation of heterogeneous services made up of diverse technologies, protocols and formats with minimal impact to the network infrastructure. This is in contrast to the technologies in opaque networks that are typically protocol and format specific. Emerging solutions for next generation AON will simultaneously allow mesh connectivity of services with different bit rates and/or modulation formats over common fibre infrastructure, thus providing a flexible transport platform for current and future services. Consequently, it is an inefficient use of network resource to provision endto- end lightpaths without considering the different optical perfor~ance requirements of.t~e different service interfaces. This thesis proposes a resource allocation mechanism that works in a heterogeneolls environment where the considered services are lO-Gb/s non-return-to-zero (NRZ) , 40-Gb/s optical duobinary (ODB) and 40-Gb/s return-to-zero differential quadrature phase shift keying (RZ-DQPSK). In particular, the focus is on the wavelength dependent nature of chromatic dispersion (CD) effect. Note that very high . . requirement is imposed on CD compensation capability in future reconfigurable network environment as the path changes dynamically. vVhile this does not have serious implication on lO-Gb/s NRZ, the same effect could highly affect 40-Gb/s services due to very low CD tolerance at the corresponding bit rate. The reduction of network layer blocking due to CD violation is proposed through resource allocation process where CD information is utilised in three different sub-problems; routing, wavelength assignment and wavelength conversion algorithms. From analytical and numerical studies, significant improvements in network blocking performance have been demonstrated when compared to the conventional techniques. This is achieved mainly by allocating services in accordance with their physical layer requirements. In particular, the best wavelength channels are reserved for 40-Gb/s services with stringent physical layer requirements. Further reduction in CD-induced blocking is obtained through dynamic dispersion compensation by pairing wavelengths with complementary CD characteristics, resulting in low net residual dispersion.
25
Saridis, Georgios. "Space division multiplexing towards all-optical data centre networks." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720834.
Full text
26
Yoon, Wong Sang 1974. "Batch wavelength assignment in all-optical central-switch networks." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10194.
Full text
27
Reis, Jacklyn Dias. "Design and optimization next generation passive all-optical networks." Doctoral thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/11299.
Full textAbstract:
Doutoramento em Engenharia Electrotécnica/TelecomunicaçõesEste trabalho investiga novas metodologias para as redes óticas de acesso de próxima geração (NG-OAN). O trabalho está dividido em quatro tópicos de investigação: projeto da rede, modelos numéricos para efeitos não lineares da fibra ótica, impacto dos efeitos não lineares da fibra ótica e otimização da rede. A rede ótica de acesso investigada nesse trabalho está projetado para suprir os requisitos de densidade de utilizadores e cobertura, isto é, suportar muitos utilizadores ( 1000) com altas velocidades de conexão dedicada ( 1 Gb/s) ocupando uma faixa estreita do espectro ( 25 nm) e comprimentos de fibra ótica até 100 km. Os cenários são baseados em redes óticas passivas com multiplexagem por divisão no comprimento de onda de alta densidade (UDWDM-PON) utilizando transmissores/receptores coerentes nos terminais da rede. A rede é avaliada para vários ritmos de transmissão usando formatos de modulação avançados, requisitos de largura de banda por utilizador e partilha de banda com tecnologias tradicionais de redes óticas passivas (PON). Modelos numéricos baseados em funções de transferência das séries de Volterra (VSTF) são demonstrados tanto para a análise dos efeitos não lineares da fibra ótica quanto para avaliação do desempenho total da rede. São apresentadas as faixas de potência e distância de transmissão nas quais as séries de Volterra apresentam resultados semelhantes ao modelo referência Split-Step Fourier (SSF) (validado experimentalmente) para o desempenho total da rede. Além disso, um algoritmo, que evita componentes espectrais com intensidade nulo, é proposto para realizar cálculos rápidos das séries. O modelo VSTF é estendido para identificar unicamente os efeitos não lineares da fibra ótica mais relevantes no cenário investigado: Self-Phase Modulation (SPM), Cross-Phase Modulation (XPM) e Four-Wave Mixing (FWM). Simulações numéricas são apresentadas para identificar o impacto isolado de cada efeito não linear da fibra ótica, SPM, XPM e FWM, no desempenho da rede com detecção coerente UDWDM-PON, transportando canais com modulação digital em fase (M-ária PSK) ou modulação digital em amplitude (M-ária QAM). A análise numérica é estendida para diferentes comprimentos de fibra ótica mono modo (SSMF), potência por canal e ritmo de transmissão por canal. Por conseguinte, expressões analíticas são extrapoladas para determinar a evolução do SPM, XPM e FWM em função da potência e distância de transmissão em cenários NG-OAN. O desempenho da rede é otimizada através da minimização parcial da interferência FWM (via espaçamento desigual dos canais), que nesse caso, é o efeito não linear da fibra ótica mais relevante. Direções para melhorias adicionas no desempenho da rede são apresentados para cenários em que o XPM é relevante, isto é, redes transportando formatos de modulação QAM. A solução, nesse caso, é baseada na utilização de técnicas de processamento digital do sinal.
This work investigates novel methodologies and models for Next-Generation Optical Access Networks (NG-OAN). The work is divided into four main topics of research: network design, numerical models for fiber nonlinear effects, impact of fiber nonlinear effects and network optimization. The used case optical access network is designed to cope with high user density over extended reach, i.e. support large number of users ( 1000) with high speed dedicated connections ( 1 Gb/s) in a narrow bandwidth ( 25 nm) distributed up to 100 km. The scenarios rely on Ultra-Dense Wavelength-Division Multiplexing Passive Optical Networks (UDWDM-PON) employing coherent transceivers in the network terminals. The network is evaluated for various transmission rates using advanced modulation formats, transmitters and receivers specifications, user bandwidth requirements and coexistence with legacy Passive Optical Network (PON) technologies. Numerical models based on Volterra Series Transfer Function (VSTF) are demonstrated for both the analysis of fiber nonlinear effects and evaluation of the overall network performance. It is presented the power and transmission ranges that Volterra series provides accurate results, compared to the reference model Split-Step Fourier (SSF) (experimentally validated), for the overall network performance. Moreover, an algorithm is proposed to provide fast numerical calculations of the series by avoiding zero intensity signal frequency components. The VSTF model is extended to identify the sole effect of the most relevant fiber nonlinearities in UDWDM-PON network scenarios: Self-Phase Modulation (SPM), Cross-Phase Modulation (XPM) and Four-Wave Mixing (FWM). Numerical simulations are performed to identify the impact of each nonlinear effect, SPM, XPM and FWM, on the performance of coherent UDWDMPON transporting either M-ary PSK (Phase-Shift Keying) or M-ary QAM (Quadrature Amplitude Modulation) modulated channels. The analysis is extended to different lengths of Standard Single-Mode Fibers (SSMF), power per channel and bit rate per channel. From that, analytic expressions are extrapolated to find the evolution of SPM, XPM and FWM with power and transmission distance for NG-AON scenarios. The performance of the network is optimized by mitigating some of the FWM crosstalk (unequally spaced channels), which in this case is the most relevant fiber nonlinear effect. The directions for further performance improvements are pointed out for scenarios in which XPM is enhanced, i.e. networks transporting QAM signaling. The solution in this case is based on digital signal processing techniques.
28
Chan, Kam Chau Tony. "Design of all-optical networks and web hosting service." HKBU Institutional Repository, 2005. http://repository.hkbu.edu.hk/etd_ra/637.
Full text
29
Le, Dinh Danh. "All-Optical Multicast Routing under Optical Constraints." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS214/document.
Full textAbstract:
Au cours de la dernière décennie, le trafic dans les réseaux a connu une croissance explosive en double environ tous les trente trois mois. Les sources à l'origine de cette croissance proviennent de nombreuses applications à grande vitesse qui impliquent la transmission de données dans des groupes de multicast. Pour réaliser la multicast optique, les routeurs optiques peuvent avoir des répartiteurs de lumière spéciaux pour diviser des signaux lumineux et des convertisseurs de longueur d'onde pour modifier les longueurs d'onde où c'est nécessaire. Cependant, la division réduit l'énergie du signal qui nécessite alors une amplification ou une régénération qui nécessitent du matériel coûteux. Les convertisseurs de longueurs d'onde aussi ne sont pas suffisamment matures pour être largement déployés dans les technologies optiques actuelles. Par conséquent, dans les réseaux tout-optique, les unités de transformation des routeurs sont souvent hétérogènes et les algorithmes de routage doivent en tenir compte tout en parvenant à des solutions de compromis coût-performances qui satisfassent les exigences de bande passante et les contraintes optiques.Dans cette thèse, nous étudions les problème de routage multicast tout-optique (AOMR) dans les réseaux tout-optique hétérogènes. L'hétérogénéité provient principalement de l'absence / présence de séparateurs de lumière et de convertisseurs de longueur d'onde et de la répartition inégale des longueurs d'onde dans les liens du réseau. En général, les problèmes de AOMR sont NP-difficiles. L'objectif de la thèse est d'analyser et de formuler les problèmes sous différentes contraintes optiques, pour rechercher des solutions optimales ou proposer des heuristiques efficaces. Les deux contextes possibles, la demande unique ou multiple de multicast, sont examinés. Toutes les propositions présentées dans la thèse sont validées par des simulations approfondies. Les principales contributions peuvent être résumées comme il suit.1) Nous identifions les structures des routes optimales pour les problèmes de l'AOMR dans les réseaux WDM hétérogènes. Comme indiqué dans la thèse, les solutions optimales ne sont plus basées sur des arbres de lumière classiques, mais sur une structure arborescente plus générale appelée hiérarchie. Certaines formes de hiérarchie pour la multicast WDM sont des parcours optiques, des hiérarchies optiques, des hiérarchies-araignée optiques ou encore des ensembles de ces routes optiques. Les algorithmes exacts et les heuristiques proposés dans la thèse sont principalement basés sur les hiérarchies.2) Dans le cas du problème de multicast avec une seule demande dans des réseaux partiellement équipés de diviseurs de lumière, nous proposons une heuristique efficace dont les résultats font le compromis entre la consommation de longueur d'onde, le coût total, et le délai de bout-en-bout.3) Dans le même cas mais dans des réseaux non équipés de diviseurs de lumière, nous prouvons la NP-difficulté, exprimons les problèmes au moyen d'un programme linéaire (ILP) pour trouver les solutions exactes et proposons plusieurs heuristiques pour calculer de bonnes solutions.4) Pour le cas de demandes multicast multiples, nous nous concentrons sur les modèles de trafic statiques dans des réseaux partiellement équipés de diviseurs mais sans convertisseurs de longueur d'onde. Tout d'abord nous proposons une formulation ILP sur la base de hiérarchies optiques afin de rechercher la solution optimale. Ensuite, utilisant un modèle de graphe en couches, nous développons plusieurs heuristiques adaptatives pour calculer des hiérarchies optiques de solutions approximatives. Ces algorithmes adaptatifs surpassent les techniques de routage existants pour minimiser la probabilité de blocage.Dans l'ensemble, la thèse souligne que les solutions optimales pour les problèmes de l'AOMR considérés correspondent à des hiérarchies, que ce soit pour une seule demande ou des demandes multiplesOver the past decade, network traffic levels experienced an explosive growth at about double amount in approximately every thirty months. The sources accounting for this growth come from numerous high-speed applications (e.g., video-on-demand, high-definition television) which involve the data transmission in multicast groups. To realize optical multicasting, optical routers should have light splitters to split light signals and wavelength converters to change the wavelengths wherever needed. However, the splitting reduces the energy of the output signal which in turn requires the costly power amplification or regeneration. Wavelength converters are also immature to be deployed widely in current optical technologies. Consequently, in all-optical networks, routers are often heterogeneous in their processing units, which challenges the routing. Therefore, it is crucial to design efficient multicast routing strategies at the backbone optical networks, in order to achieve cost-performance tradeoff solutions while satisfying the ever-increasing bandwidth demands and optical constraints.In this thesis, we investigate the all-optical multicast routing (AOMR) problems in heterogeneous optical networks. The heterogeneity mainly comes from the absence/presence of light splitters and wavelength converters and the uneven distribution of wavelengths in the network links. In general, AOMR problems are often NP-hard. The objective of the thesis is to analyze and formulate the problems, to search for the optimal solutions, and to propose efficient heuristics to solve the problems under different optical constraints. Both possible contexts, i.e., single-multicast request and multiple-multicast requests, are examined. All the reported results in the thesis are supported by extensive and careful simulations. The major contributions can be summarized as follows.1) We identify the optimal route structures for AOMR problems under heterogeneous mesh WDM networks. As shown in the thesis, the optimal solutions are no longer based on conventional light-trees, but a more general tree-like structure called hierarchy. Some forms of hierarchy realized for WDM multicasting are light-trails, light-hierarchies, light-spider hierarchies and a set of these light-structures. The exact and heuristic algorithms proposed in the thesis are mainly based on hierarchy. 2) For single-multicast with sparse-splitting case, we propose an efficient heuristic algorithm to produce a good tradeoff solution among wavelength consumption, channel total cost and end-to-end delay.3) For single-multicast with non-splitting case, we prove the NP-hardness, identify the optimal solution as a set of light-spider hierarchies, formulate the problems by means of Integer Linear Program (ILP) formulations to find the exact solution, and propose several cost-effective heuristic algorithms to compute the approximate solutions. 4) For the case with multiple-multicast requests, we focus on static traffic patterns under sparse-splitting without wavelength conversion case. First, an ILP formulation based on light-hierarchies is proposed to search for the optimal solution. By applying the layered graph model, we then develop several adaptive heuristic algorithms to compute light-hierarchies for approximate solutions. These adaptive algorithms outperform the existing fixed routing ones in minimizing the blocking probability. Overall, the thesis points out that the optimal solutions for heterogeneously constrained AOMR problems correspond to hierarchies, regardless of request multiplicity consideration
30
Maamoun, Khaled M. "Deploying Monitoring Trails for Fault Localization in All-optical Networks and Radio-over-Fiber Passive Optical Networks." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23195.
Full textAbstract:
Fault localization is the process of realizing the true source of a failure from a set of collected failure notifications. Isolating failure recovery within the network optical domain is necessary to resolve alarm storm problems. The introduction of the monitoring trail (m-trail) has been proven to deliver better performance by employing monitoring resources in a form of optical trails - a monitoring framework that generalizes all the previously reported counterparts. In this dissertation, the m-trail design is explored and a focus is given to the analysis on using m-trails with established lightpaths to achieve fault localization. This process saves network resources by reducing the number of the m-trails required for fault localization and therefore the number of wavelengths used in the network. A novel approach based on Geographic Midpoint Technique, an adapted version of the Chinese Postman’s Problem (CPP) solution and an adapted version of the Traveling Salesman’s Problem (TSP) solution algorithms is introduced. The desirable features of network architectures and the enabling of innovative technologies for delivering future millimeter-waveband (mm-WB) Radio-over-Fiber (RoF) systems for wireless services integrated in a Dense Wavelength Division Multiplexing (DWDM) is proposed in this dissertation. For the conceptual illustration, a DWDM RoF system with channel spacing of 12.5 GHz is considered. The mm-WB Radio Frequency (RF) signal is obtained at each Optical Network Unit (ONU) by simultaneously using optical heterodyning photo detection between two optical carriers. The generated RF modulated signal has a frequency of 12.5 GHz. This RoF system is easy, cost-effective, resistant to laser phase noise and also reduces maintenance needs, in principle. A revision of related RoF network proposals and experiments is also included. A number of models for Passive Optical Networks (PON)/ RoF-PON that combine both innovative and existing ideas along with a number of solutions for m-trail design problem of these models are proposed. The comparison between these models uses the expected survivability function which proved that these models are liable to be implemented in the new and existing PON/ RoF-PON systems. This dissertation is followed by recommendation of possible directions for future research in this area.
31
Wang, Jade P. (Jade Peilynn) 1979. "Demonstrating effective all-optical processing in ultrafast data networks using semiconductor optical amplifiers." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44907.
Full textAbstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references.
The demand for bandwidth in worldwide data networks continues to increase due to growing Internet use and high-bandwidth applications such as video. All-optical signal processing is one promising technique for providing the necessary capacity and offers payload transparency, power consumption which scales efficiently with increasing bit rates, reduced processing latency, and ultrafast performance. In this thesis, we focus on using semiconductor optical amplifier-based logic gates to address both routing and regeneration needs in ultrafast data networks. To address routing needs, we demonstrate a scalable, multi-packet all-optical header processing unit operating at a line rate of 40 Gb/s. For this experiment, we used the ultrafast nonlinear interferometer (UNI) gate, a discrete optical logic gate which has been demonstrated at speeds of 100 Gb/s for bit-wise switching. However, for all-optical switching to become a reality, integration is necessary to significantly reduce the cost of manufacturing, installation, and operation. One promising integrated all-optical logic gate is the semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI). This gate has previously been demonstrated capable of up to 80 Gb/s bit-wise switching operation. To enable simple installation and operation of this gate, we developed a performance optimization method which can quickly and accurately pinpoint the optimal operating point of the switch. This eliminates the need for a time-intensive search over a large parameter space and significantly simplifies the operation of the switch. With this method, we demonstrate the ability of a single SOA-MZI logic gate to regenerate ultrafast pulses over 100 passes and 10,000 km in a regenerative loop. Ultimately, all-optical logic gates must be integrated on a single low-cost platform and demonstrated in cascaded, multi-gate operation for increased functionality.
(cont.) This requires low-loss monolithic integration. Our approach to this involves an asymmetric twin waveguide (ATG) design. This design also has the potential for high-yields as a result of a high tolerance for fabrication errors. We present our characterization results of ATG waveguides and proposals for future improvements.
by Jade P. Wang.
Ph.D.
32
Als, Adrian Andrew. "Mathematical modelling of all-optical buffering for ultrafast optical time division multiplexed networks." Thesis, Sheffield Hallam University, 2004. http://shura.shu.ac.uk/19258/.
Full textAbstract:
The development of a practical solution to all-optical buffer remains a challenge for high-speed (> 20 Gbit/s) optical networks. Most of the research in the field has concentrated on building test-bed solutions, however the literature review shows little evidence in the use of mathematical models to aid in the design process. This PhD study is an attempt to design and develop a mathematical model of an all-optical buffer suitable for use within optical time division multiplexed systems. The emphasis is placed on recirculating fibre loop buffers because of their inherent storage advantages. The most critical of these advantages is that the storage delay time is independent of the fibre length. While there is a precedent of employing large recirculating fibre loop architectures to simulate ultra-long haul transmission lines in research projects, their use in short length (< 500m) buffering architectures is not prevalent in the literature. This work finds a niche in this domain where the physical effects of the buffer components (e.g. optical switches) have not been previously documented. In order to optimise the bit error rate performance and characterise its dependence on the physical buffer characteristics, the buffer models are designed and simulated in MATLAB and VPI. The associated mathematical models, developed in this work, are validated by the results produced using these simulation packages. The benefit of this research is reflected in the fact that varying the parameters of the mathematical model effectively simulates the changing of physical device characteristics. Consequently, the designing process becomes less arduous, as lengthy simulation times are now reduced. Moreover, as physical implementation can now be delayed until the buffer design is optimised, production cost may be reduced.
33
Koontz, Elisabeth Marley 1970. "The development of components for ultrafast all-optical communication networks." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9065.
Full textAbstract:
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (p. 149-158).
The need for ultrafast (greater than 100 Gbps) all-optical communication networks is amplified as the amount of data-containing communication traffic continues to grow at an exorbitant rate. Multiplexing schemes are attractive, as they enable increased transmission over silica fiber already buried and in use. One of the key components enabling Wavelength Division Multiplexed (WDM) propagation is the distributed feedback (DFB) laser. A periodic index modulation, typically buried within the device structure (hence requiring an overgrowth step), is used to select the specific operating wavelength of the laser. As the WDM wavelength spacing continues to decrease, the increasing demands placed on the fabrication of the DFB lasers bring the fabrication issues to the forefront. Similar patterned surface overgrowth issues need to be addressed for realization of wavelength-selective filters, e.g. Bragg-resonant filters, for all-optical routing. Issues pertaining to the formation of buried index contrasts, for application to future WDM network components, are addressed. Of importance to Time Division Multiplexed (TDM)-based propagation schemes is the multiplexing and demultiplexing of the ultrafast data streams. All-optical switching as well as optical (de)multiplexing are very attractive alternatives to optoelectronic conversion. Many optical switching schemes require the use of a semiconductor optical amplifier (SOA) as the nonlinear medium, as well as optical clock sources with repetition rates on the order of GHz (for integration with electronic components). For TDM network propagation rates on the order of Tbps, lasers must be capable of producing pulses shorter than a picosecond. Mode-locking of laser cavities is an attractive method of ultrashort pulse generation. A semiconductor saturable absorber mirror is a monolithically integrated device utilized for passive mode-locking of a wide variety of lasers. The development of SOAs as well as semiconductor saturable absorber mirrors is discussed.
Elisabeth Marley Koontz.
Ph.D.
34
Ribeiro, Vítor Manuel Costa. "Monitoring and all-optical signal processing techniques for transparent networks." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14240.
Full textAbstract:
Doutoramento em Engenharia EletrotécnicaOptical networks are under constant evolution. The growing demand for dynamism require devices that can accommodate different types of traffic. Thus the study of transparent optical networks arises. This approach makes optical networks more "elegant" , due to a more efficient use of network resources. In this thesis, the author proposes devices that intend to form alternative approaches both in the state of art of these same technologies both in the fitting of this technologies in transparent optical networks. Given that full transparency is difficult to achieve with current technology (perhaps with more developed optical computing this is possible), the author proposes techniques with different levels of transparency. On the topic of performance of optical networks, the author proposes two techniques for monitoring chromatic dispersion with different levels of transparency. In Chapter 3 the proposed technique seems to make more sense for long-haul optical transmission links and high transmission rates, not only due to its moderate complexity but also to its potential moderate/high cost. However it is proposed to several modulation formats, particularly those that have a protruding clock component. In Chapter 4 the transparency level was not tested for various modulation formats, however some transparency is achieved by not adding any electrical device after the receiver (other than an analog-digital converter). This allows that this technique can operate at high transmission rates in excess of 100 Gbit / s, if electro-optical asynchronous sampling is used before the optical receiver. Thus a low cost and low bandwidth photo-detector can be used. In chapter 5 is demonstrated a technique for simultaneously monitoring multiple impairments of the optical network by generating novel performance analysis diagrams and by use of artificial neural networks. In chapter 6 the author demonstrates an all-optical technique for controlling the optical state of polarization and an example of how all-optical signal processing can fully cooperate with optical performance monitoring.
As redes ópticas estão em constante desenvolvimento. A crescente demanda por dinamismo das mesmas requer cada vez mais, dispositivos que possam albergar diversos tipos de tráfego. Dessa forma surge o estudo sobre redes ópticas transparentes. Este tipo de abordagem torna as redes ópticas mais ’elegantes’, devido a um uso mais eficiente dos recursos da rede. Nesta tese o autor propõe dispositivos que pretendem formar alternativas quer no estado da arte destas mesmas tecnologias quer no encaixe das mesmas em redes ópticas transparentes. Dado que a transparência total é dificil de alcançar com as tecnologias atuais (talvez com computação óptica mais desenvolvida isso seja possível), o autor propõe técnicas com diferentes níveis de transparência. No âmbito da monitoria de desempenho óptico o autor propôe duas técnicas para a monitoria da dispersão cromática com diferentes niveis de transparência. No Capítulo 3 a técnica proposta parece fazer mais sentido para transmissões ópticas de longo curso e a elevadas taxas de transmissão, não só devido à sua moderada complexidade, mas também ao seu potencial custo. No entanto esta, é proposta para vários formatos de modulação, especialmente aqueles que têm uma componente de relógio bem saliente. No Capítulo 4, o nível de transparência não foi testado para vários formatos de modulação, no entanto alguma transparência é obtida através da não inclusão de nenhum dispositivo eléctrico após o receptor (excepto um conversor analógico-digital). Isto permite que esta técnica possa operar a elevadas taxas de transmissão acima de 100 Gbit~s, se for utilizada amostragem electro-óptica assíncrona antes do receptor. Dessa forma pode ser utilizado um fotodetector de baixo custo e de baixa largura de banda. No capítulo 5 é demonstrada uma técnica para monitoria em simultâneo de vários impedimentos da rede óptica atráves de um novo método para gerar diagramas de análise de desempenho com redes neuronais artificiais. No capítulo 6 o autor demonstra uma técnica para controlo da polarização, totalmente processada no domínio óptico assim como um exemplo de como o processamento totalmente óptico pode cooperar com o monitoria do desempenho óptico.
35
Irfan, Anis Muhammad. "An experimental investigation of all-optical processing techniques for application in elastic optical networks." Thesis, University of Essex, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617039.
Full textAbstract:
Due to continued growth of internet at a starling rate and the introduction of new broadband services, such as cloud computing, IPTV and high-definition media streaming, there is a requirement for a flexible bandwidth infrastructure that supports mobility of data at peta-scale. Elastic networking based on gridless spectrum technology are emerging as a promising solution for the flexible spectral networking paradigm in heterogeneous optical networks supporting future internet traffic demands. Recently, intense research initiatives are focusing on a more flexible spectrum allocation approach than the standard ITU-T grid. The main difficulty with realising this scenario is the need for a transmission link, able to accommodate and manage a diverse set of channels having different modulation format, baud-rate and spectral occupancy. Segmented use of the spectrum may result in the lack of availability of sufficiently wide spectrum slots for high bit rate signals, which would lead to wavelength contention. Moreover, on demand slot assignment causes not only divergence from the optimal route but also have spectrum fragmentation, which degrades spectrum utilization efficiency. The main contribution is the development of feasible solutions for the efficient transport of heterogeneous traffic by enhancing the flexibility of the optical layer in allocating network resources as well as for the implementation of an adaptable infrastructure that provides on-demand functionality according to traffic requirements. For this, experimental investigation of elastic networks that support flexible optical node architecture, have the capability of re-arranging ch31mels in a fragmented spectrum by all optical signal processing functionalities such as format conversion, wavelength conversion, spectrum defragmentation and grooming of high speed signals in order to maintain an efficient resource utilisation has been undertaken. More specifically, this thesis presents a detailed description and results from the following published experimental work: Defragmentation and Grooming on 85.4 Gb/s by Simultaneous Format and Wavelength Conversion, Gridless networking first field trial with flexible spectrum switching nodes over 620km field fibre links. A novel all optical traffic grooming node for the application of elastic optical network.
36
Solano, Donado Fernando. "Label space reduction in GMPLs and All-Optical Label Swapping networks." Doctoral thesis, Universitat de Girona, 2007. http://hdl.handle.net/10803/7603.
Full textAbstract:
All-Optical Label Swapping (AOLS) es una tecnología clave para la implementación de nodos de conmutación completamente óptica de paquetes. Sin embargo, el costo de su desarrollo es proporcional al tamaño del espacio de etiquetas (label space). Debido a que los principios de funcionamiento de AOLS son casos particulares de los del MultiProtocol Label Switching (MPLS), esta tesis estudia métodos generales, aplicables a ambos, con el propósito de reducir el espacio de etiquetas tanto como sea posible. Modelos de programación lineal entera y heurísticas son propuestos para el caso en el que se permite apilar una etiqueta extra. Encontramos que cerca del 50% del espacio de etiquetas puede ser reducido, si se permite colocar una etiqueta extra en la pila. Además, particularmente para AOLS, encontramos que se puede reducir el espacio de etiquetas cerca al 25% si se duplica la capacidad de los enlaces y se permite re-encaminar el tráfico.All-Optical Label Swapping (AOLS) forms a key technology towards the implementation of All-Optical Packet Switching nodes for the future optical Internet. However, the capital expenditures of the deployment of AOLS increases with the size of the label spaces. Since AOLS working principle is a particular case of the MultiProtocol Label Switching (MPLS) protocol, this thesis studies generic methods, applicable to both, in order to reduce as much as possible the label space. ILP models and heuristics are proposed for the case in which it is allowed to stack one extra label. In general, we found that 50% of the label space can be saved, if it is permitted to push one extra label in the stack. For the case of AOLS, we found that we can reduce the label space down to 25% if we are allowed to double the link capacity and reroute the traffic.
37
Savage, Shelby Jay 1978. "All-optical interferometric switches for data regeneration in fiber optic networks." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40509.
Full textAbstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.Includes bibliographical references.
In the thirty years since the installation of the first fiber optic data link, data rates in installed fiber links have risen from a few Mb/s to tens of Gb/s. In the laboratory, data rates in a single optical fiber have already reached tens of Tb/s. These data rates greatly exceed electronic processing rates, so researchers have turned to all-optical signal processing to achieve many basic network tasks, like wavelength conversion, packet switching, and data regeneration. As data rates increase, the impairments caused by propagation through the glass of optical fiber become worse. Chromatic dispersion causes the temporal broadening of optical bits during propagation, leading to interference between neighboring bits. Nonlinear effects, like the nonlinear index of refraction and four-wave mixing, can cause interference between neighboring wavelength channels. The interaction of dispersion and nonlinearities can lead to variations in the timing of bits and the appearance of optical energy where there had been none. All these effects make 1-bits and 0-bits difficult to distinguish. Today, these distortions are overcome by electronic regenerators. Optical data streams are converted to electrical signals, processed electronically, converted back to an optical signal, and returned to the optical network. In this way, regenerators prevent the accumulation of noise and prevent noise from contributing to the production of more noise. The electronic solution is costly because of the extra hardware required for optical to electrical to optical conversions and performs poorly because of the losses incurred by those conversions. In this thesis, we investigate two regenerators that restore the data quality of ON/OFF keyed data without a conversion of the data to the electrical domain.
(cont..) Both regenerators are based on all-optical switches that take two inputs: the data pulses from the network, and a locally generated clock-pulse train. The all-optical switches then modulate the data pattern onto the clock-pulse train, which becomes the new data stream. The first switch we consider, the WMFUNI, uses the nonlinear properties of fiber to produce the switching action. Using the WMFUNI regenerator, we demonstrate the propagation of 10 Gb/s data over 20,000 km of commercial optical fiber. We also demonstrate the WMFUNI's ability to operate on 40-Gb/s data. Unfortunately, fiber has only a weak nonlinearity, so the WMFUNI is large (~40 cmx40 cm). The second switch uses the much stronger nonlinearity of a semiconductor optical amplifier (SOA). SOA-based switches can be integrated onto chip-scale optics. The switch we test, the SOA-MZI, fits on a ~0.5 cmxl cm chip. Using the SOA-MZI regenerator, we demonstrate the propagation of 10 Gb/s data over 10,000 km of commercial optical fiber. We also show in simulation that the SOA-MZI's operation may be extended to 40 Gb/s.
by Shelby Jay Savage.
Ph.D.
38
Mocan, Bora Dinleyici Mehmet Salih. "A Novel Method Of Routing In All-Optical Packet Switched Networks/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/elektrikveelektronikmuh/T000135.rar.
Full text
39
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.Includes bibliographical references (leaves 127-134). Also available in electronic version. Access restricted to campus users.
40
Habib, Christian. "All-optical label swapping strategies for spectral amplitude code labels in packet-switched optical networks." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116005.
Full textAbstract:
There is currently much work focused on developing packet-switched optical networks to overcome the limitations of existing optical networks. Switch design for packet-switched optical networks is particularly challenging, in part due to the lack of a practical optical memory system. As a result, optical labels and all-optical label processing have attracted much attention. This thesis examines a crucial label processing component of an optical packet switch, namely the label swapper.In this thesis, three different tabletop topologies for low-cost all-optical swapping of spectral amplitude code labels for packet-switched networks are examined in a proof-of-concept phase. The first uses cross-absorption modulation in an electro-absorption modulator within a semiconductor fiber ring laser (SFRL), the second uses cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA) within an SFRL, and the third makes use of XGM in a SOA as well as injection locking in a Fabry-Perot laser diode for wavelength conversion. The benefits and limitations of each approach as well as future improvements are discussed. Building on these results, a high-performance integrated version of XGM swapper is designed, simulated, and masks are produced for fabrication using indium phosphide technology.
41
INCERTI, GABRIELE. "All optical 2R regeneration systems for broadband agile dense wavelength division multiplexing transparent optical networks." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1422.
Full textAbstract:
Recentemente è stata notata una crescita dei servizi multimediali richiesti dagli utenti finali; in tal modo numerose soluzioni sono state implementate per garantire elevati bit rate e qualità del servizio necessari per questo tipo di applicazioni. Le reti completamente ottiche sono state stese in molte nazioni (Giappone, Corea, Cina) per fornire servizi a banda larga fino a casa dell'utente.
Conseguentemente, sono richiesti dispositivi in grado di operare nel dominio ottico in modo tale da evitare il noto “collo di bottiglia” derivante dalle conversioni di formato O/E/O (ottico/elettrico/ottico). In questo modo, nuovi tipi di sistemi (per esempio: optical processing e passive optical network) in grado di operare nel dominio completamente ottico sono richiesti poiché solo questo tipo di soluzione è la miglior strada per offrire alte prestazioni in termini di servizi, rate e riduzione dei costi per bit.
Il lavoro eseguito durante questo dottorato di ricerca è stato incentrato sull'evoluzione di dispositivi per la rigenerazione ottica in grado di operare al contempo una Ri-amplificazione e Ri-sagomatura (2R) dei segnali ottici. Studi ed esperimenti sono stati effettuati nei laboratori dell’ ISCOM sfruttando la possibilità di rigenerazione completamente ottica di un dispositivo 2R multi-canale in grado di lavorare e gestire più clients nel medesimo istante temporale. Il sistema è stato implementato in uno scenario DWDM (Dense Wavelegth Division Multiplexing); inoltre, lavorando nel dominio completamente ottico sono state eliminate le conversioni di formato (O/E/O).
Il sistema di rigenerazione è basato sulla modulazione di fase presente all'interno della fibra ottica usata per ottenere, sotto particolari condizioni, la generazione di nuove repliche del segnale originario che si vuole rigenerare. Queste nuove repliche, essendo posizionate a nuove lunghezze d’onda, possono essere usate sia per ottenere una conversione di lunghezza d’onda sia per ottenere una rigenerazione ottica dei segnali. Ciascuna replica, infatti, è caratterizzata dall’ avere un andamento simile alle funzioni di Bessel in grado di eliminare il rumore accumulatosi durante la trasmissione dei segnali.
L’idea di questo lavoro è basato su un approccio multi-lunghezza d’onda in modo tale da poter usare un solo dispositivo per fornire una rigenerazione 2R completamente ottica ai numerosi utenti operanti a 10 Gbps.
La capacità dei sistemi, implementati nei laboratori ISCOM, di risagomare i segnali, è stata confermata sperimentalmente in termini di misurazioni di diagramma ad occhio dei segnali di uscita e dalle curve di BER (Bit Error Rate).A recent increase of multimedia service demand from end-users has been noticed, thus several solutions have been implemented to guarantee the high rate and relative QoS (Quality of Service) needed for these kind of services. All optical networks have been deployed in many countries (Japan, Korea, China, at all) in order to supply broadband services to the home. Consequently, devices able to operate in optical domain are requested in order to avoid the so called “bottle-neck” coming from the O/E/O data conversion format. Thus, new kind of systems (optical processing and passive optical networks, at all) able to operate in photonic domain are requested because only this kind of solution is the better way to offer high performances in term of services, rate and low cost per bit. The work performed during this PhD program has been focused on the evolution of regeneration devices able to perform Re-amp and Re-shaping also know as 2R. Studies and experiments have been carried out at the ISCOM labs exploiting the possibility to a multi-channel 2R all optical regeneration device which is able to work with different client signals at the same time. The system has been implemented in a dense WDM (Wavelength Division Multiplexing) scenario. Moreover, working completely in optical domain, the format conversion (O/E/O) is avoided. The regeneration system is based on phase modulation present in the fiber and used to obtain, under particular conditions, the generation of new signal replica. These new replica, being placed at new different wavelengths can be used both to reach a wavelength conversion and to obtain an all optical regeneration effect. Each replica, in fact, is characterized by a Bessel like transfer function able to clean the noise accumulated along the signal transmission. The idea of this work is based on a multi-wavelength approach, thus only one device can be used to provide all optical 2R regeneration to several client signals at 10 Gbps at the same time. The ability of the systems, implemented at the ISCOM labs, to reshape the signals, has been experimentally confirmed in terms of eyes diagrams and BER (Bit Error Rate) measurements.
42
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."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.
43
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
44
Gryspolakis, Nikolaos. "On the suitability of fibre optical parametric amplifiers for use in all-optical agile photonic networks." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66657.
Full textAbstract:
The objective of this thesis is to investigate the suitability of fibre optical parametric amplifiers (FOPAs) for use in multi-channel, dynamic networks. First, we investigate their quasi-static behaviour in such an environment. We study the behaviour of a FOPA under realistic conditions and we examine the impact on the gain spectrum of channel addition for several different operating conditions and regimes. In particular, we examine the impact of surviving channel(s) position, input power and channel spacing. We see how these parameters affect the gain tilt as well as its dynamic characteristics, namely the generation of under or over-shoots at the transition point, possible dependence of rise and fall times on any of the aforementioned parameters and how the gain excursions depend on those parameters. For these studies we assume continuous wave operation for all signals. We observe that the gain spectrum changes are a function of the position and the spacing of the channels. We also find that the gain excursion can reach several dBs (up to 5 dB) in the case of channel add/drop and are heavily dependent on the position of the surviving channels. The channels located in the middle of the transmission band are more prone to channel add/drop-induced gain changes. Moreover, we investigate for the first time the FOPA dynamic behaviour in a packet switching scenario. This part of the study assumes that all but one channels normally vary in a packet-switched fashion. The remaining channel (probe channel) is expected to undergo gain variations due to the perturbation of the system experienced by the other channels. Furthermore, we consider several different scenarios for which the channels spacing, per channel input power (PCIP), variance of the power fluctuation and position of the probe channel will change. We find that when the FOPA operates near saturation the target gain is not achieved more than 50% of thL'objectif de cette thèse est d'explorer l'utilité des amplificateurs paramétriques à fibre optique (APFO) à l'intérieur de réseaux dynamiques à canaux multiples.Tout d'abord, nous investiguons le comportement quasi-statique des amplificateurs dans un tel environnement. Nous étudions le comportement d'un APFO dans des conditions réalistes et nous examinons l'impact de l'addition de canaux sur le spectre d'amplification sous plusieurs conditions d'opération. En particulier, nous examinons l'impact de la position du canal survivant, de la puissance initiale et de l'espace des canaux. Nous présentons comment ces paramètres affectent l'inclinaison du spectre d'amplification ainsi que sa dynamique, incluant la présence de dépassements et de sous-dépassements au point de transition, la dépendance possible des temps de monté et de descentes sur les paramètres mentionnés précédemment et comment l'amplification varie selon ces paramètres. Pour ces études nous assumons une opération continue pour tous les signaux. Nous observons que les changements au spectre d'amplification se produisent en fonction de la position et de l'espacement des canaux. Nous remarquons aussi que la variation d'amplification peut atteindre plusieurs dB (jusqu'à 5 dB) dans le cas de l'ajout ou de la suppression de plusieurs canaux et qu'elle dépend lourdement de la position des canaux survivants. Les canaux situés au centre de la bande de transmission sont plus susceptible aux variations d'amplification due à l'ajout ou à la suppression d'autres canaux.De plus, nous étudions pour la première fois le comportement dynamique d'un APFO dans un réseau où il y a commutation par paquets. Cette portion de l'étude assume que tous les canaux sauf un varient selon une distribution Gaussienne. Le canal restant devrait subir des variations d'amplification du aux perturbations causé par les autres canaux. Nous considé
45
Hu, Weiwei. "DEVELOPMENT AND EVALUATION OF A WAVELENGTH REARRANGEMENT SCHEME IN ALL-OPTICAL NETWORKS." MSSTATE, 2004. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11102004-111738/.
Full textAbstract:
As WDM results in an ever-increasing trend of traffic concentration, any failure on a single fiber-link or a single switching node will be catastrophic. Rapid restoration can recover the affected traffic so as to make the network more robust and reliable. The conventional restoration methods are designed mostly for reconfiguring the network topology; they are not immune from service interruption. In this thesis, an effective algorithm called backup-path-wavelength rearrangement scheme is proposed to reduce the connection blocking probability in an all-optical network. The proposed scheme performs wavelength retuning on the backup paths to improve the acceptance probability for new connection requests and introduce zero service interruption to the traffic in the network. The performance evaluation indicates that the connection blocking probability can be decreased greatly by the proposed scheme. The combination of BPWR and traffic grooming can efficiently alleviate the wavelength continuity constraint.
46
Proestaki, Aikaterini. "Design and dimensioning of all-optical dual-homing hierarchical multi-ring networks." Thesis, University of Essex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313066.
Full text
47
Campbell, Gregory S. (Gregory Sebastian). "A computer simulation model suite for the analysis of all optical networks." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/35455.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.Includes bibliographical references (p. 203).
by Gregory S. Campbell.
M.Eng.
48
Li, Jonathan Chi Fai. "Eye closure penalty based signal quality metric for intelligent all-optical networks /." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/7047.
Full text
49
Chouman, Hussein. "Impairment-aware design and performance evaluation of all-optical wavelength convertible networks." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT011/document.
Full textAbstract:
La croissance continue du trafic Internet implique une augmentation de la consommation d'énergie en raison des nombreuses conversions optique à électronique(OEO) requises par les routeurs et les commutateurs. L'utilisation de réseaux transparents pourraient freiner cette croissance incontrôlée, mais le maintien des données dans le domaine optique a deux conséquences néfastes: une accumulation du bruit et des non-linéarités de l'amplification qui dégrade fortement les performances au niveau de la couche physique. et la contrainte de continuité de longueur d'onde (WCC) reflétant la conservation de la longueur d'onde du signal optique dans les réseaux optiques multiplexés en longueur d'onde (WDM) qui dégradent les performances du réseau, notamment sa probabilité de blocage. Les convertisseurs de longueur d'onde (WC) peuvent pallier la contrainte WCC, mais les seuls dispositifs suffisamment matures disponibles dans le commerce sont les WC basés sur OEO (OEO-WC). Cependant, leur coût augmente avec les débits binaires. D'autre part, des convertisseurs de longueur d'onde tout optique (AO-WC) ont été démontrés dans des laboratoires de recherche, avec toutefois une plage de conversion limitée et une dégradation du signal converti.Dans cette thèse, nous concevons la couche de transmission en utilisant deux ensembles de formats de modulation différents avec des plages de débits différentes; et par conséquent différents modèles d'estimation de performance. Au niveau du réseau, nos analyses montrent que la contribution des WC dépend des demandes de trafic servant à l’ordre dans un scénario de planification du réseau; qu'en utilisant des algorithmes fixed-alternate-routing (FAR) ou least-loaded-routing (LLR) et un algorithme d'affectation de longueur d'onde first-fit (FF), les AO-WCs offrent les mêmes améliorations de performances que les OEO-WC. De plus, nous identifions une plage de conversion et une cascadabilité optimale d’AO-WC qui montre que le LLR nécessite un nombre de conversions par canal inférieur au FARThe continuous growth of Internet traffic implies an increased power consumption due to the many optical-to-electronic (OEO) conversions required by routers and switches. Transparent networks could curb this uncontrolled growth, but keeping the data in the optical domain has two adverse consequences: physical layer impairments accumulation which strongly degrades the performance due to amplication noise and non-linearities; and the wavelength continuity constraint (WCC) to keep the opticalsignal's wavelength unchanged in wavelength-division-multiplexed (WDM) optical networks which degrades network blocking performance. Wavelength converters (WCs) can alleviate the WCC constraint, but the only commercially available devices are the OEO-based WCs (OEO-WCs), however, their cost increases with bit-rates. On the other hand, all-optical wavelength converters (AO-WCs) have been demonstrated in research laboratories albeit with a limited conversion range and a performance that degrades converted signal's quality.In this thesis, we design the transmission layer using two different modulation formats sets with different bit-rates ranges; and consequently different performance estimation models. At the network level, our analyses show that WCs' contribution depends on traffic demands serving ordering in the online traffic assumption; that using xed-alternate routing (FAR) or least-loaded routing (LLR) algorithms and first-fit (FF) wavelength assignment algorithm, AO-WCs give the same performance enhancement as OEO-WCs. Moreover, we identify an optimum AO-WC conversion range and cascadability which shows that LLR requires lower number of conversions per channel compared to FAR
50
Leith, Christopher. "Analytical models for all-optical networks employing wavelength division multiplexing and wavelength conversion." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0002/MQ42649.pdf.
Full text