.. Système-complet44, Le détail des éléments passifs du "remote node" (rectangle jaune) est donné par la gure 4, p.136

X. Xgs-pon-puisque-basé-sur-du and T. Tdma, Le prototype réalisé par un fournisseur et évalué à la n du quatrième chapitre a montré sa capacité à répondre aux contraintes du CPRI pour un débit de 2.5Gb/s. ? Et ensuite ? Pour sa part, le NG-PON2-TWDM peine à progresser. Le problème de la réalisation à bas coût d'émetteurs colorless, accordables, présentant un faible dérapage en longueur d'onde tout en répondant aux demandes de puissance de sortie requises, reste le verrou majeur de la technologie. En attendant la levée de ce verrou, les discussions de l'ITU-T et du FSAN s'animent autour des suites à donner aux technologies d'accès. L'intérêt des acteurs du marché semble se porter vers trois solutions : Une technologie à 25Gb/s, proposant un unique canal de transmission dans chaque sens, La réalisation de systèmes self-seeded commerciaux reste cependant limitée par le débit

N. Une-Évolution-du, T. Présentant-quatre-canaux, and . Twdma-modulés-chacun-non, Comme dans le NG-PON2, il est prévu que ces équipements soient colorless Une superposition de quatre systèmes TDM/TDMA à 25Gb/s/canal, basée sur des longueurs d'onde xes, inspirée des travaux de l'IEEE. Dans un premier temps, le premier canal en longueur d'onde est partagé par l'ensemble des clients Si un client (ou un groupe de clients) requiert plus de débit, le fournisseur d'accès lui propose le second canal en longueur d'onde et l'équipement associé. Cet équipement consiste alors côté client en un ONU proposant deux canaux d'émission, avec deux émetteurs et deux récepteurs, réalisant chacun des transmissions à 25Gb/s. Si la demande du client n'est toujours pas satisfaite

. Dans-ces-trois-cas, utilisation de la bande O semble privilégiée puisqu'elle permet de s'aranchir de l'importance considérable de la dispersion chromatique sur les transmissions à 25Gb/s. D'autre part, la possibilité d'interactions non-linéaires dans l'accès ne sera plus négligeable

. La-puissance-optique-nécessaire and . Au, respect des budgets optiques pourra entrainer des interactions par émission Raman stimulée, comme décrit dans le troisième chapitre de ce document (selon les plages de longueur d'onde allouées), mais aussi par le "mélange à quatre ondes" (four-wave mixing) En eet, l'absence de dispersion chromatique en bande O implique une vitesse de groupe identique pour des signaux de longueurs d'onde diérentes

. Enn, utilisation du TWDM mode burst dans le sens montant semblerait toujours d'actualité , et donc

@. Brevets, G. Simon, F. Saliou, and P. Chanclou, Les diérents points abordés par cette thèse restent donc pertinents pour les futures générations de réseaux d'accès optique. Conclusion générale et perspectives Contributions personnelles INPI n o FR 16 52878, 2016.

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