Active APD gain control for an optical receiver

Details Active APD gain control for an optical receiver Active APD gain control for an optical receiver

1997-02-04

1999-07-27

Kim, Robert H.

Optics: measuring and testing

For optical fiber or waveguide inspection

250214AG, G01N 2100

Patent

active

059299827

ABSTRACT:
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.

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patent: 5532474 (1996-07-01), Dautet et al.
patent: 5625181 (1997-04-01), Yasuda et al.

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