Optical system employing near-incoherent processing for...

H - Electricity – 04 – B

Patent

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H04B 10/18 (2006.01) G02B 27/10 (2006.01)

Patent

CA 2211923

A system for correcting nonlinear distortion in fiber optic systems including communication systems by means of light modulation provided by interferometric modulators such as the Mach-Zehnder. The present invention involves the addition of a correction signal which contains error canceling information. The additive correction signal optical beam is frequency shifted or phase scrambled through the use of a phase or frequency modulator. This insures the corrective light signal adds incoherently or quasi-incoherently within the signal bandwidth of interest. Furthermore, the present system rquires only a single light source and can be made independent of wavelength and is easily optimized with active servo devices. A system provided by the present invention also provides improvement over the state of the art because of its high degree of correction and independence from link length using ordinary single mode fibers.

L'invention concerne un système qui permet de corriger les distorsions non linéaires dans les structures à fibres optiques, dont les systèmes de communication, qui consiste à utiliser la modulation de la lumière assurée par des modulateurs interférométriques tels que le Mach-Zehnder. On ajoute un signal de correction qui contient l'information de suppression d'erreurs. Le faisceau optique du signal de correction additif est décalé en fréquence ou embrouillé en phase à l'aide d'un modulateur de fréquence ou de phase. Ainsi, le signal lumineux de correction s'ajoute de manière incohérente ou quasi-incohérente dans la largeur de bande des signaux considérés. De plus, le système ne nécessite qu'une seule source lumineuse, peut être rendu indépendamment de la longueur d'onde et optimisé aisément à l'aide de dispositifs d'asservissement actifs. L'autre amélioration par rapport à la technique existante réside dans le degré élevé de correction propre au système et dans l'indépendance qu'il offre par rapport à la longueur de liaisons obtenue avec des fibres monomode ordinaires.

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