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Dissertations / Theses on the topic 'Coherence multiplexing'

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Published: 4 June 2021

Last updated: 6 February 2022

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1

Meijerink, Arjan. "Coherence multiplexing for optical communication systems." Enschede : University of Twente [Host], 2005. http://doc.utwente.nl/50841.

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2

Elwardi, Ben Amor Sonia. "Architectures optiques / optoélectroniques haute densité dédiées au calcul et aux traitement des signaux." Thesis, Evry, Institut national des télécommunications, 2015. http://www.theses.fr/2015TELE0001/document.

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Les travaux développés dans ce manuscrit de thèse concernent la proposition et la mise au point d’une nouvelle architecture optique basée sur la modulation de cohérence (MC) d’une source à spectre large dédiée aux calculs arithmétiques et au traitement des signaux. La modulation de cohérence de lumière est une technique particulière de codage optique qui autorise, entre autres, le multiplexage des signaux à travers une seule porteuse. Les signaux à traiter sont codés en MC par le biais de paires modulateur de lumière/lame de phase placées en série et éclairées par un seul faisceau de lumière p

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3

He, Qubao. "Coherent power combining on spacecraft via wavefront Multiplexing techniques." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527380.

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<p> A novel orthogonal wavefront (WF) Multiplexing (Muxing) and De-Multiplexing (Demuxing) scheme is proposed for uplink from antenna array elements to multiple spacecraft (S/C). By using an adaptive equalization at the receiver of S/C, the phase deviation due to different near field distances of the uplink from antenna array elements to S/C is compensated via the WF Demuxing method on S/C. This scheme allows power combining from antenna array elements to S/C. Besides, this scheme can be extended and applied to multiple S/C. Simulations verify that the proposed scheme achieves the same bit err

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4

De, la Gorce Aliénor. "Manipulation des propriétés de cohérence spatio-temporelle de la lumière par mélange à deux ondes opto-numérique." Thesis, université Paris-Saclay, 2020. https://pastel.archives-ouvertes.fr/tel-03179767.

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La propagation de signaux optiques à travers des milieux diffusants ou multimodes est un problème largement étudié dans la communauté scientifique. De nombreuses études ont été conduites dans le but de développer des méthodes efficaces pour la reconstruction d'information après une propagation ayant modifié le contenu envoyé. De telles études font échos à de nombreux domaines d'applications, comme les télécommunications optiques ou l'endoscopie en biologie. Dans ce but, de nombreuses approches ont été envisagées dans les dernières années. Certaines s'appuient sur l'utilisation de cristaux phot

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5

Jan, Omar [Verfasser]. "Implementation and simulation study of coherent optical orthogonal frequency-division multiplexing systems / Omar Jan." Paderborn : Universitätsbibliothek, 2015. http://d-nb.info/1073944905/34.

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6

Rawle, Christopher B., and n/a. "Coherent multiwavelength sources for tropospheric aerosol lidar." University of Otago. Department of Physics, 2005. http://adt.otago.ac.nz./public/adt-NZDU20070427.114533.

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The monitoring and study of the earth�s atmosphere is becoming an increasingly important task given the current uncertainties in climate prediction. Areas where lidar has been used to further understanding of the atmosphere include monitoring of greenhouse gases, global warming, stratospheric ozone depletion, photochemical smog and aerosol photochemistry. However, the potentially severe long term effects of anthropogenic aerosols on earth�s biosphere are poorly understood. This project seeks to apply state of the art laser technology to develop an innovative multiwavelength lidar system capabl

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7

Puntsri, Kidsanapong [Verfasser]. "Investigation of receiver concepts for coherent optical orthogonal frequency division multiplexing communication systems / Kidsanapong Puntsri." Paderborn : Universitätsbibliothek, 2015. http://d-nb.info/1076574866/34.

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8

Alluri, Veerendra Bhargav. "MULTIPLE CHANNEL COHERENT AMPLITUDE MODULATED (AM) TIME DIVISION MULTIPLEXING (TDM) SOFTWARE DEFINED RADIO (SDR) RECEIVER." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/499.

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It is often required in communication and navigation systems to be able to receive signals from multiple stations simultaneously. A common practice to do this is to use multiple hardware resources; a different set of resources for each station. In this thesis, a Coherent Amplitude Modulated (AM) receiver system was developed based on Software Defined Radio (SDR) technology enabling reception of multiple signals using hardware resources needed only for one station. The receiver system architecture employs Time Division Multiplexing (TDM) to share the single hardware resource among multiple stre

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9

Tebben, Daniel James. "Limitations and Improvement of Subcarrier Multiplexed Systems over Optical Fiber." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/26968.

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Optical coherent techniques are used to eliminate the power fading found in optical subcarrier multiplexed systems. In a double-side band optical subcarrier system the signal experiences a periodic power fading that is dependent on the fiber dispersion and subcarrier frequency. This power fading is manifested during the direct detection of the subcarrier system using a square-law photodetector. Using a modified optical local oscillator to coherently detect the subcarrier channel this power fading can be eliminated. An optical local oscillator is centered at the optical carrier in order t

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10

Dapore, Benjamin R. "Phase Noise Analysis of 3D Images From a Two Wavelength Coherent Imaging System." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1375447146.

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11

Gemechu, Wasyhun Asefa. "Comparison of nonlinear frequency division multiplexing and OFDM for optical fiber transmissions." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT021/document.

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La capacité ultime du canal dans les systèmes de transmission optique à longue distance est limitée par les effets non linéaires liés à la propagation dans les fibres optiques. Des techniques de compensation des effets non-linéaires, tel que la DBP (Digital Back Propagation), ont été proposées pour surmonter ces limitations et accroître la capacité. Compte tenu de leur complexité d’implémentation, leur gain en performance reste très limité. Cela a déclenché très récemment la recherche de nouvelles techniques de communication prenant en compte la non-linéarité de la fibre. Une nouvelle méthode

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12

Koebele, Clemens. "Mode-division-multiplexing as a possibility to cope with the increasing capacity demand in optical transmission systems." Phd thesis, Institut National des Télécommunications, 2012. http://tel.archives-ouvertes.fr/tel-00762642.

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Currently deployed optical transmission systems use coherent detection for data rates of 40 Gb/s and 100 Gb/s. Quadrature phase shift keying (QPSK) modulation using four phase levels in combination with polarization division multiplexing (PDM) allows transmitting four bits per symbol. The use of more complex modulation formats, such as 16 level quadrature amplitude modulation (16QAM) allows increasing the data rate. However, this method reduces dramatically the transmission reach. For example, when passing from 100 Gb/s PDM-QPSK to 200 Gb/s PDM-16QAM, the reach is reduced by a factor of five.

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13

Mousa, Pasandi Mohammad. "Adaptive decision-directed channel equalization and laser phase noise induced inter-carrier-inteference mitigation for coherent optical orthogonal frequency division multiplexing transport systems." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114464.

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The explosive growth of global Internet traffic has placed tremendous strain on both op-tical networks and optical transmission systems, underscoring the need for not only high-capacity transmission links but also for flexible, reconfigurable, and adaptive networks. Re-cent progress in complementary metal–oxide–semiconductor (CMOS) technology has fa-cilitated the use of digital signal processing (DSP) in optical communication systems. Blessed with the revival of coherent optical transmission systems, over the past few years, DSP-enabled, software-defined optical transmission (SDOT) systems hav

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14

Shang, Lei, and lei shang@ieee org. "Modelling of Mobile Fading Channels with Fading Mitigation Techniques." RMIT University. Electrical and Computer Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061222.113303.

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This thesis aims to contribute to the developments of wireless communication systems. The work generally consists of three parts: the first part is a discussion on general digital communication systems, the second part focuses on wireless channel modelling and fading mitigation techniques, and in the third part we discuss the possible application of advanced digital signal processing, especially time-frequency representation and blind source separation, to wireless communication systems. The first part considers general digital communication systems which will be incorporated i

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15

Carvalho, Luis Henrique Hecker de 1988. "Avaliação experimental da transmissão óptica em altas taxas de supercanais com diferentes técnicas de multiplexação de subportadoras : Experimental evaluation of high-speed optical transmission of superchannels formed by different subcarrier multiplexing techniques." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261925.

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Orientadores: Aldário Chrestani Bordonalli, Júlio César Rodrigues Fernandes de Oliveira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-09-27T13:36:17Z (GMT). No. of bitstreams: 1 Carvalho_LuisHenriqueHeckerde_M.pdf: 8092940 bytes, checksum: da29699f8638d37de27fc0743c89a013 (MD5) Previous issue date: 2014<br>Resumo: Uma das alternativas para os sistemas de transmissão óptica de próxima geração é o uso de múltiplos subcanais ópticos densamente multiplexados em frequência (supercanais) com alta

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16

LI, XIAOXU. "WAVELENGTH-DIVISION-MULTIPLEXED TRANSMISSION USING SEMICONDUCTOR OPTICAL AMPLIFIERS AND ELECTRONIC IMPAIRMENT COMPENSATION." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4025.

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Over the last decade, rapid growth of broadband services necessitated research aimed at increasing transmission capacity in fiber-optic communication systems. Wavelength division multiplexing (WDM) technology has been widely used in fiber-optic systems to fully utilize fiber transmission bandwidth. Among optical amplifiers for WDM transmission, semiconductor optical amplifier (SOA) is a promising candidate, thanks to its broad bandwidth, compact size, and low cost. In transmission systems using SOAs, due to their large noise figures, high signal launching powers are required to ensure reasonab

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17

Zou, Ding, and Ding Zou. "FPGA-Based LDPC Coded Modulations for Optical Transport Networks." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/622985.

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Current coherent optical transmission systems focus on single carrier solutions for 400Gb/s serial transmission to support traffic growth in fiber-optics communications, together with a few subcarriers multiplexed solutions for the 1 Tb/s serial data rates and beyond. With the advancement of analog-to-digital converter technologies, high order modulation formats up to 64-QAM with symbol rate up to 72Gbaud have been demonstrated experimentally with Raman amplification. To enable such high serial data rates, it is highly desirable to implement in hardware low complexity digital signal processi

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18

Ferreira, Rafael Jales Lima. "Estudo de sistemas com multiportadoras ópticas ortogonais e coerentes." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-29042013-113736/.

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Neste trabalho a técnica de multiportadoras OFDM (Orthogonal Frequency Division Multiplexing), aplicada a sistemas ópticos, é estudada, com foco principal na geração e transmissão dos chamados supercanais ópticos modulados em altíssimas taxas (até Terabits/s). O OFDM prevê um melhor aproveitamento da largura de banda e, quando comparada à técnica FDM (Frequency Division Multiplexing), permite uma redução de aproximadamente 50% do espectro ocupado. Esta economia proporcionada pela técnica torna-a forte candidata para uso em redes ópticas reconfiguráveis, pois provê melhor eficiência espectral a

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19

Kakkar, Aditya. "Theoretical Investigation of a new OFDM Access-Network Topology (OTONES)." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-128712.

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Recent studies on growth of telecomm sector depict an ever rising demand for high bandwidth applications such as on-line gaming, high definition television and many more. This demand is coupled with increase in internet connected utilities per house hold - each requiring a portion of bandwidth. The fast development of broadband telecommunication services calls for an upgrade of access infrastructure. This challenge could be met by technologies such as Fiber-To-The-Home/Building (FTTH/B) point-to-multipoint (P2MP) optical access networking. Further, FTTH is also widely regarded as a future proo

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20

Shahpari, Ali. "Next generation optical access networks : technologies and economics." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14857.

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Doutoramento em Engenharia Eletrotécnica - Telecomunicações<br>The work presented herein, studies Next Generation Optical Access Networks (NG-OAN) economically (e.g. energy consumption) and technologically (e.g. rate, reach and dedicated/shared bandwidth). The work is divided into four main topics: energy efficiency in optical access architectures, novel spectrally efficient Long-Reach Passive Optical Networks (LR-PON), crosstalk impacts in heterogeneous and homogenous access networks and hybrid optical wireless transmissions. We investigate the impact of user profiles, optical distribution n

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21

Mestre, Adrover Miquel Angel. "Data center optical networks : short- and long-term solutions." Thesis, Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0022/document.

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Les centres de données deviennent de plus en plus importants, allant de petites fermes de serveurs distribuées à des grandes fermes dédiées à des tâches spécifiques. La diffusion de services "dans le nuage" conduit à une augmentation incessante de la demande de trafic dans les centres de données. Dans cette thèse, nous étudions l'évolution des réseaux dans les centres de données et proposons des solutions à court et à long terme pour leur intra-connexion physique. Aujourd'hui, la croissance de la demande de trafic met en lumière la nécessité urgente d’interfaces à grande vitesse capables de fa

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22

Fernandez, de Jauregui Ruiz Ivan. "Advanced modulation formats and nonlinear mitigation for spectral efficient optical transmission systems." Thesis, Evry, Institut national des télécommunications, 2018. http://www.theses.fr/2018TELE0009/document.

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La majeure partie des communications mondiales est transportée par des systèmes transocéaniques à fibre optique. Il est estimé que d'ici 2020 le trafic de données atteindra 4.3 ZB par an. Afin de faire face à cette demande, différentes technologies sont actuellement étudiées pour augmenter la capacité des systèmes de transmission très longue distance. Avec l'avènement des circuits intégrés à haute vitesse, des formats de modulation avancés et des techniques de traitement de signal numérique (DSP) peuvent être utilisés pour maximiser l'efficacité spectrale de transmission. Par ailleurs, la capa

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23

Wu, Hsuan-Ju, and 吳弦儒. "Studies on Non-coplanar Angular-polarization Multiplexing and Coherence Gating in Synthetic Aperture Digital Holographic Microscopy." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/xx5k8r.

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碩士<br>國立臺灣師範大學<br>光電科技研究所<br>105<br>This works mainly discusses how to optimize the system resolution in the digital holographic microscopy (DHM). We also try to enhance the system stability and simplify the experimental architecture by applying common-path setup. Finally, we set of non-coplanar angular-polarization multiplexing and coherence gating in synthetic aperture digital holographic microscopy system. This research bases on transmission type DHM. This work presents a common-path synthetic aperture digital holographic microscopy using spiral phase plate to improve phase stability and sp

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24

李揚漢. "Performance analysis of coherent subcarrier multiplexing optical fiber communication system." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/65735930711552560971.

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25

Ziaie, Somayeh. "Coherent technologies for flexible optical networks." Doctoral thesis, 2020. http://hdl.handle.net/10773/29349.

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Next-generation networks enable a broad range of innovative services with the best delivery by utilizing very dense wired/wireless networks. However, the development of future networks will require several breakthroughs in optical networks such as high-performance optical transceivers to support a very-high capacity optical network as well as optimization of the network concept, ensuring a dramatic reduction of the cost per bit. At the same time, all of the optical network segments (metro, access, long-haul) need new technology options to support high capacity, spectral efficiency and

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26

Tang, Yan. "High-speed optical transmission system using coherent optical orthogonal frequency-division multiplexing." 2010. http://repository.unimelb.edu.au/10187/8405.

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Recently, Coherent Optical Orthogonal Frequency-division Multiplexing (CO-OFDM) has been considered as a promising technology for high-speed optical transmission due to its easiness of dispersion compensation, high optical spectral efficiency and superior scalability over the channel dispersion and data rate. In this thesis, we conduct analysis on the transceiver nonlinearity impact on a coherent optical Orthogonal Frequency-division Multiplexing (OFDM) system and the feasibility of transmitting up to 1 Tb/s per channel data rate over CO-OFDM WDM systems.<br>We investigate the optimum design f

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27

Neves, Manuel dos Santos. "Laser phase noise mitigation for subcarrier-multiplexing optical transmission systems." Master's thesis, 2020. http://hdl.handle.net/10773/29172.

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Multi-subcarrier optical systems have recently attracted the attention of the scienti c and industrial communities, owing to their inherent advantages in terms of ber propagation performance as well as their implementation complexity, when compared with legacy single-carrier systems. With the imminent introduction of next-generation transceivers supporting aggregate symbol-rates beyond 100 Gbaud, the achievable gains provided by multisubcarrier modulation are becoming increasingly more important, thereby attracting the attention of several leader optical manufacturers, which are now i

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28

Sousa, Artur Neves e. "Transmission techniques for high rates in optical fiber and alternative media." Doctoral thesis, 2020. http://hdl.handle.net/10773/31994.

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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 i

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29

Πέτρου, Κωνσταντίνος. "Μελέτη αλγορίθμων ψηφιακής επεξεργασίας σήματος για ομόδυνο δέκτη QPSK σε οπτικά συστήματα μεγάλων αποστάσεων υψηλής φασματικής απόδοσης". Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/3832.

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The scope of this dissertation is to investigate the merits and implications of using multilevel modulation formats in optical communications systems. Following the trend in academia and industry, special focus is placed on quadrature phase-shift keying (QPSK), and specifically on polarization division multiplexed (PDM) QPSK. A special kind of receiver is investigated thoroughly, the digital coherent receiver, the equivalent of the coherent quadrature demodulator in classical communications nomenclature. A large number of digital signal processing (DSP) algorithms are implemented, some of them

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