Auto-power control circuit to maintain extinction ratio of...

Details Auto-power control circuit to maintain extinction ratio of... Auto-power control circuit to maintain extinction ratio of...

2008-02-14

2010-10-05

Van Roy, Tod T (Department: 2828)

Coherent light generators

Particular component circuitry

Having feedback circuitry

C372S029011, C372S029021, C372S031000, C372S038020, C372S038070, C372S038090

Reexamination Certificate

active

07809034

ABSTRACT:
The present invention provides an auto-power control (APC) circuit and a method to stabilize the extinction ratio of an optical output from a laser diode (LD) in an optical transmitter. The APC circuit according to the invention includes two feedback loops for the modulation IMand the bias current IBeach having variable loop gain. The extinction ratio of the optical output from the LD is kept constant by setting the ratio of the loop gains of respective APC circuits to be ER−1.

REFERENCES:
patent: 6909731 (2005-06-01), Lu
patent: 6975658 (2005-12-01), Roach
patent: 2002/0009109 (2002-01-01), Asano
patent: 11-112437 (1990-04-01), None
patent: 2004-87845 (2004-03-01), None

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