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Impact of cascaded filters-based OADMs in an all optical backbone network/Influence des multiplexeurs d’insertion-extraction optiques, fondés sur des filtres en cascade, sur un réseau dorsal entièrement optique

Influence des multiplexeurs d’insertion-extraction optiques, fondés sur des filtres en cascade, sur un réseau dorsal entièrement optique

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Abstract

In all optical backbone networks, the introduction of Ultra Long Haul (ulh) optical systems associated with Optical Add Drop Multiplexers (oadm) gives rise to new network architectures and also to new engineering constraints, because signals suffer effects which do not exist in networks today. The purpose of this paper is to study, through numerical simulations, the impact on the signal brought by the concatenation of oadms. It is usually predicted that the transmission quality is severely degraded by filtering effects. However, the simulations show that by introducing for example a small amount of non-linearities, degradations do not obligatorily happen.

So as to highlight the effects of some parameters, we have built, in the simulation tool, different components having particular properties to vary amplitude, frequency and phase of filter group delay ripple. We show how in some circumstances, the eye widens due to cross phase modulation reduction or due to the interplay between chromatic dispersion and non-linear effects.

Résumé

Dans les réseaux dorsaux entièrement optiques, l’introduction des systèmes à très longue portée (ulh) associés aux multiplexeurs à insertion-extraction optique (mieo) conduit à de nouvelles architectures et à de nouvelles contraintes en matière d’ingénierie, parce que le signal subit des effets qui n’existent pas dans les réseaux actuels. L’objectif de cette communication est d’étudier, grâce à des simulations, l’impact que peut avoir une cascade de mieo sur le signal dans un lien d’un réseau tout optique. Il est couramment admis que l’introduction de tels composants ne peut que dégrader la qualité de la transmission. Or les simulations montrent qu’en introduisant par exemple une part raisonnable de non-linéarités, la mise en cascade de mieo contenant des filtres dans une liaison ne produit pas obligatoirement une dégradation des performances.

Pour mettre en évidence l’effet des différents paramètres des filtres, nous avons construit dans le simulateur utilisé des composants ayant des caractéristiques particulières afin de faire varier les paramètres des ondulations du temps de groupe, amplitude, fréquence et phase. Nous montrons comment, dans certaines conditions, l’ouverture de l’œil s’améliore grâce à la réduction de la modulation de phase croisée ou à l’interaction entre la dispersion chromatique et les effets non linéaires.

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The authors were with France Télécom, division R&D — Technopole Anticipa, 22307 Lannion, France up to 12/31/2006.

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Joindot, I., Joindot, M. Impact of cascaded filters-based OADMs in an all optical backbone network/Influence des multiplexeurs d’insertion-extraction optiques, fondés sur des filtres en cascade, sur un réseau dorsal entièrement optique. Ann. Telecommun. 62, 550–566 (2007). https://doi.org/10.1007/BF03253276

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