Method and device for controlling bias of optical modulator

Details Method and device for controlling bias of optical modulator Method and device for controlling bias of optical modulator

G - Physics

02

F

G02F 1/03 (2006.01) G02F 1/035 (2006.01)

Patent

CA 2520633

A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even with a simple structure. An optical modulator bias controller (B) for controlling the DC bias of each optical modulating section of an optical modulator (1) is characterized by comprising DC bias application means (3) for applying a DC bias to each of the optical modulating sections, a low-frequency signal superimposing circuit (2) for superimposing a low-frequency signal fB with a specific frequency on a modulating signal b applied to each optical modulating section, optical sensing means (9) for sensing a change of the intensity of the light wave passing through the combining section, and bias control means (4) for extracting the change of the intensity of light corresponding to the low- frequency signal from the optical sensing means and controlling the DC bias application means according to the extracted change of the intensity of light.

L'invention concerne un procédé et un dispositif permettant de réguler de manière appropriée la polarisation CC de chacune des sections de modulation optiques d'un modulateur optique, même lorsque le modulateur optique est actionné en mode normal et même avec une structure simple. Un contrôleur (B) de modulateur optique, utilisé pour réguler la polarisation CC de chaque section de modulation optique d'un modulateur optique (1) se caractérise en ce qu'il comprend un moyen d'application de polarisation CC à chacune des sections de modulation, un circuit de superposition de signal basse fréquence (2) pour superposer un signal basse fréquence f<SB>B</SB>, ayant une fréquence spécifique, à un signal de modulation b, appliqué à chaque section de modulation ; un moyen de détection optique (9) pour détecter un changement d'intensité de l'onde lumineuse traversant la section de combinaison et un moyen de régulation de polarisation (4) pour extraire le changement d'intensité lumineuse correspondant au signal basse fréquence provenant du moyen de détection optique et régulant le moyen d'application de polarisation CC selon le changement extrait de l'intensité lumineuse.

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