Optical communications – Receiver – Heterodyne
Reexamination Certificate
2006-08-22
2006-08-22
Tran, Dzung (Department: 2613)
Optical communications
Receiver
Heterodyne
C398S206000, C375S261000, C375S298000
Reexamination Certificate
active
07095963
ABSTRACT:
An optical receiver system for processing signals output from a polarization diversity detector that includes a plurality of photodetector cells. Each cell provides an signal that includes a phase generated carrier signal having a modulation frequency ω and a sensor signal that has an in-phase component I and a quadrature phase component Q superimposed on the phase generated carrier signal. A plurality of variable gain amplifiers are arranged to produce a plurality of amplified signals. A feedback circuit is connected to the plurality of variable gain amplifiers for controlling the gains thereof. A plurality of demodulator circuits are arranged to receive the amplified signals. The demodulator circuits are arranged to provide for each photodetector cell an I signal output that indicates an amplitude of the in-phase component I and a Q signal output that indicates an amplitude of the quadrature phase component Q.
REFERENCES:
patent: 5287556 (1994-02-01), Cahill
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5600474 (1997-02-01), Tomesen et al.
patent: 5852507 (1998-12-01), Hall
patent: 6693670 (2004-02-01), Stark
Douglass, IV John Thomson
Ferraro Eugene Louis
Knaack William Christopher
Litton Systems Inc.
Lynn & Lynn
Tran Dzung
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