Active apd gain control for an optical receiver

H - Electricity – 04 – B

Patent

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H04B 10/06 (2006.01) H03G 1/00 (2006.01) H03G 3/24 (2006.01)

Patent

CA 2228347

An active avalanche photo-diode, APD, gain control circuit for use in an optical receiver includes a bias generator for varying the bias on a variable gain APD in response to bias control values generated by a controller. The controller receives the output of the optical receiver and determines the system noise of the receiver for the various bias control values. The system noise is compared to a threshold value for establishing the optimum bias for optimum gain of the APD. The gain control circuit is useable in an optical receiver in an optical time domain reflectometer, OTDR, for increasing the dynamic range of the OTDR.

Circuit de commande de gain à APD (photodiode à avalanche) active destiné à un récepteur optique. Comprend un générateur de polarisation pour varier la polarisation d'une APD à gain variable selon des valeurs de commande de tension de polarisation générées par un contrôleur. Le contrôleur reçoit la sortie d'un récepteur optique et détermine le bruit de système du récepteur pour les diverses valeurs de commande de polarisation. Le bruit de système est comparé à une valeur de seuil afin d'établir la polarisation optimale pour un gain optimal de l'APD. Le circuit de commande de gain est utilisable dans un récepteur optique de réflectomètre optique temporel (OTDR) afin d'accroître la dynamique de l'OTDR.

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