Doctorat d\u00e9livr\u00e9 conjointement par
\nT\u00e9l\u00e9com SudParis et l\u2019Universit\u00e9 Pierre et Marie Cu
\nrie
\n\u00c9cole doctorale Informatique, T\u00e9l\u00e9communications et
\n\u00c9lectronique (Paris)
\nLaboratoire SAMOVAR \/ D\u00e9partement d\u2019\u00e9lectronique et
\nphysique<\/p>\n
Contribution \u00e0 l\u2019optimisation des syst\u00e8mes de trans Par Aida SECK<\/strong><\/p>\n le 18 f\u00e9vrier<\/strong> \u00e0 14h00 dans les locaux du le jury :<\/strong><\/p>\n R\u00e9sum\u00e9 :<\/strong><\/p>\n La demande en capacit\u00e9 li\u00e9e \u00e0 la transmission de to Afin de r\u00e9pondre \u00e0 cette demande croissante, de nou En plus des Des interrogations r\u00e9sident sur l\u2019 Dans cette optique, nous avons \u00e9tudi\u00e9 l\u2019i Ceci a \u00e9t\u00e9 r\u00e9alis\u00e9 en simulation num\u00e9 D\u2019autre part, La compr\u00e9hension et L\u2019uti Par cons\u00e9quent le d\u00e9veloppement des fu Nous avons \u00e9tabli dans ce travail Abstract :<\/strong><\/p>\n The ever-increasing demand of capacity in very high bit rate coherent optical transmission systems has paved the way towards the investigation of several techniques such as the use of ultra-low loss fibers, Erbium doped fiber amplifiers ? polarization and wavelength division multiplexing (WDM), coherent detection, multi-level modulation formats, spatial division multiplexing, etc. However, there are questions concerning polarization division multiplexing and a development towards some advanced modulation formats including phase modulation and polarization division multiplexing. In this thesis, in order to increase the capacity-by-distance product of future optical coherent systems using wavelength and polarization division multiplexing, we first study spectral shaping of the transmitted signals to increase the information spectral density. For this purpose, we have numerically investigated the multi-channel transmission performance of Polarization Switched Quadrature Phase Shift Keying (PSQPSK) and we have compared it to the performance of Polarization-Division-Multiplexed QPSK (PDM-QPSK), using Root Raised Cosine (RRC) spectral shaping, in the context of a flexible channel grid. In addition we have presented the advantage of PS-QPSK against PDM-QPSK as a function of the system parameters, while we have also discussed the benefit of a RRC spectral shaping against a tight filtering at the transmitter side with a 2nd order super- Gaussian-shaped filter. Furthermore, we have focused on nonlinear effects that limit the transmission distance by degrading the transmitted symbols during propagation. Analyzing and reducing the impact of nonlinear effects is essential when using technologies that increase the information spectral density such as polarization division multiplexing which causes new nonlinear effects due to additional interactions between symbols during the propagation through the fiber. Therefore a reduction of the impact of nonlinear effects is necessary for the development of future systems with higher bit rates of 400 Gbit\/s and 1 Tbit\/s per channel. We have established in this thesis, design rules to reduce the impact of nonlinear effects in the optical WDM transmission systems at 100 Gbit\/s per channel that use polarization multiplexing <\/p>\n Doctorat d\u00e9livr\u00e9 conjointement par T\u00e9l\u00e9com SudParis et l\u2019Universit\u00e9 Pierre et Marie Cu rie \u00c9cole doctorale Informatique, T\u00e9l\u00e9communications et \u00c9lectronique (Paris) Laboratoire SAMOVAR \/ D\u00e9partement d\u2019\u00e9lectronique et physique Contribution \u00e0 l\u2019optimisation des syst\u00e8mes de trans mission optiques coh\u00e9rents (Nx100 Gbit\/s) utilisant le multipl formats de modulation en phase et une conception de ligne limitant l\u2019impact Par 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\nmission optiques
\ncoh\u00e9rents (Nx100 Gbit\/s) utilisant le multipl
\nformats de modulation en phase et une conception de
\nligne limitant l\u2019impact<\/strong><\/p>\n
\nCEA Saclay Nano – 91191 Gif-sur-Yvette Cedex,
\nen amphith\u00e9\u00e2tre P.33<\/strong><\/p>\n\n
\nDirecteur de recherche CNRS, CEO Photline technolog
\nies
\nM. Christophe PEUCHERET
\nProfesseur, ENSSAT<\/li>\n<\/ul>\n\n
\nIng\u00e9nieur de recherche, chef de groupe, Alcatel-lucent<\/li>\n<\/ul>\n\n
\nArchitecte r\u00e9seau terrestre, Orange Labs<\/li>\n<\/ul>\n\n
\nProfesseur, UPMC<\/li>\n<\/ul>\n\n
\nMa\u00eetre de conf\u00e9rences
\n, T\u00e9l\u00e9com SudParis<\/li>\n<\/ul>\n\n
\nProfesseur, T\u00e9l\u00e9com SudParis<\/li>\n<\/ul>\n
\nut type d\u2019information (voix, vid\u00e9os, donn\u00e9es, etc.)
\nne cesse de cro\u00eetre.<\/p>\n
\nvelles g\u00e9n\u00e9rations de syst\u00e8mes de communication mul
\ntiplex\u00e9s en
\nlongueur d\u2019onde transmettant des d\u00e9bits \u00e9lev\u00e9s d\u2019in
\nformation par canal (100 Gbit\/s ou plus) doivent \u00eat
\nre con\u00e7ues. <\/p>\n
\nfibres ayant de tr\u00e8s faibles pertes, des amplificat
\neurs \u00e0 fibre dop\u00e9e \u00e0 l\u2019Erbium et du multiplexage en
\nlongueur d\u2019onde, des
\ntechnologies sont mises en place, comme notamment l
\ne multiplexage en polarisation, la d\u00e9tection coh\u00e9re
\nnte, les formats de
\nmodulation multi-niveaux et plus r\u00e9cemment le multi
\nplexage spatial. <\/p>\n
\nimpact du multiplexage
\nen polarisation ainsi qu\u2019un d\u00e9veloppement vers des
\nformats de modulation plus \u00e9volu\u00e9s incluant modulat
\nion de phase et
\nmultiplexage en polarisation. Dans cette th\u00e8se, afi
\nn de contribuer \u00e0 l\u2019augmentation du produit capacit
\n\u00e9 x distance dans les
\nsyst\u00e8mes de transmission Nx100 Gbit\/s par fibre opt
\nique \u00e9galement multiplex\u00e9s en polarisation et utili
\nsant la d\u00e9tection
\ncoh\u00e9rente, nous avons \u00e9tudi\u00e9 d\u2019une part, la mise en
\nforme spectrale des signaux \u00e0 l\u2019\u00e9mission pour augm
\nenter la densit\u00e9
\nspectrale d\u2019information (ISD: Information Spectral
\ndensity). <\/p>\n
\nmpact du filtrage \u00e9troit
\ngaussien du second ordre et de la mise en forme spe
\nctrale en racine de cosinus sur\u00e9lev\u00e9 (RRC:
\nRoot Raised Cosine
\n) sur les
\nsignaux \u00e9mis dans le cas de modulations en Polariza
\ntion Division Multiplexed-Quaternary Phase Shift Ke
\nying (PDM-QPSK)
\net Polarization-Switched-Quaternary Phase Shift Key
\ning (PS-QPSK). <\/p>\n
\nrique en
\nconsid\u00e9rant un espacement spectral entre les diff\u00e9r
\nents canaux variable. Nous avons montr\u00e9 qu\u2019en tenan
\nt compte \u00e0 la fois du
\nfacteur de qualit\u00e9 maximal et de la densit\u00e9 spectra
\nle d\u2019information, l\u2019application de la mise en forme
\nRRC sur des signaux
\nmodul\u00e9s en PS-QPSK, fournit de meilleures performan
\nces de transmission dans une configuration o\u00f9 toute
\nla dispersion est
\ncompens\u00e9e en fin de propagation, pour toutes les va
\nleurs d\u2019espacement spectral \u00e9tudi\u00e9es. <\/p>\n
\nnous nous sommes
\nint\u00e9ress\u00e9s aux effets non-lin\u00e9aires qui limitent la
\nport\u00e9e de ces syst\u00e8mes en d\u00e9gradant pendant la pro
\npagation, les symboles
\n\u00e9mis, par les interactions entre des symboles d\u2019un
\nm\u00eame canal, entre canaux ou modes de polarisation.<\/p>\n
\nla r\u00e9duction de l\u2019impact des effets non-lin\u00e9aires e
\nst indispensable lorsqu\u2019on veut utiliser certaines
\ntechnologies pour
\naugmenter la densit\u00e9 spectrale d\u2019information.<\/p>\n
\nlisation du multiplexage en polarisation par exempl
\ne, se heurte aux
\nd\u00e9gradations caus\u00e9es par les effets non-lin\u00e9aires c
\nar de nouvelles interactions entre symboles sont pr
\n\u00e9sentes pendant la
\npropagation. <\/p>\n
\nturs syst\u00e8mes ayant des d\u00e9bits plus \u00e9lev\u00e9s de 400 G
\nbit\/s et 1 Tbit\/s par
\ncanal passe par une diminution de l\u2019impact des effe
\nts non-lin\u00e9aires. <\/p>\n
\nde th\u00e8se, des r\u00e8gles de
\nconception permettant de r\u00e9duire l\u2019impact des effet
\ns non-lin\u00e9aires entre polarisation dans les syst\u00e8me
\ns de transmission
\noptiques consid\u00e9r\u00e9s.<\/p>\n
\n","protected":false},"excerpt":{"rendered":"