Coherent detection associated with digital signal processing for fiber optics communication

Gabriel Charlet

doi:10.1016/j.crhy.2008.10.019

Coherent detection associated with digital signal processing for fiber optics communication
[Détection cohérente associée au traitement du signal numérique pour la communication par fibre optique]

Gabriel Charlet ¹

¹ Alcatel-Lucent, Bell-Labs France, Centre de Villarceaux, Route de Villejust, 91620 Nozay, France

Comptes Rendus. Physique, Volume 9 (2008) no. 9-10, pp. 1012-1030.

Résumé
Abstract

Les systèmes de transmission optiques ont vu leur performances (capacité de transmission du système et portée) très fortement augmenter au cours des quinze dernières années par l'introduction de nouvelles technologies telles que les amplificateurs optique large bande, le multiplexage en longueur d'onde (WDM), la gestion de dispersion chromatique, les équipements fonctionnant au débit de 10 Gbit/s et maintenant de 40 Gbit/s ainsi que de formats de modulation utilisant la modulation de phase (DPSK)… . Afin de continuer à augmenter la capacité du système tout en diminuant les contraintes associées à la propagation de canaux à très haut débit (100 Gbit/s), l'association de formats de modulation multi-niveaux avec des techniques de détection cohérente associées à du traitement du signal numérique apparaît comme très efficace. Les méthodes de modulation et de détection utilisées actuellement seront décrites ainsi que le fonctionnement d'un récepteur cohérent. L'efficacité de la détection cohérente pour compenser les distorsions linéaires introduites par la propagation sera aussi détaillé. Nous verrons également que l'association de la réception cohérente avec des formats multi-niveaux est particulièrement prometteuse au débit de 100 Gbit/s. Finalement, les limitations des systèmes de transmission optique utilisant ces techniques de détection cohérente seront expliquées.

Optical transmission systems have seen their performance (system capacity and system reach) drastically improved in the last 15 years by using new technologies such as wide band optical amplification, wavelength division multiplexing (WDM), dispersion management, introduction of 10 Gbit/s channel rate and now 40 Gbit/s, Differential Phase Shift Keying (DPSK) modulation… . In order to further increase system capacity while relaxing the constraints associated with higher channel rate (i.e. 100 Gbit/s), the association of multilevel modulation format with coherent detection and digital signal processing appears as a key enabler. This article describes the actual modulation and detection methods in order to explain how a coherent receiver including digital signal processing works. The efficiency of coherent receiver to compensate for linear distortions induced by fiber optic propagation will also be detailed. The promising association of coherent receiver with multilevel modulation format, especially for 100 Gbit/s channel rate will be described. Eventually, the limitations of optical communication systems relying on coherent detection will be explained.

Publié le : 2008-11-01

DOI : 10.1016/j.crhy.2008.10.019

Keywords: Phase shift keying, Optical communication, Polarization multiplexing, Optical modulation, Coherent detection, Digital signal processing
Mot clés : Modulation de phase, Communication optique, Multiplexage en polarisation, Modulation optique, Détection cohérente, Traitement du signal numérique

Affiliations des auteurs :

Gabriel Charlet ¹

¹ Alcatel-Lucent, Bell-Labs France, Centre de Villarceaux, Route de Villejust, 91620 Nozay, France

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     title = {Coherent detection associated with digital signal processing for fiber optics communication},
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Gabriel Charlet. Coherent detection associated with digital signal processing for fiber optics communication. Comptes Rendus. Physique, Volume 9 (2008) no. 9-10, pp. 1012-1030. doi : 10.1016/j.crhy.2008.10.019. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2008.10.019/

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