Patent ID: 7095963
Filing Date: 2006-08-22
Classification: G01H,H04B

Abstract:
1. An optical receiver system for processing signals output from a polarization diversity detector that includes a plurality of photodetector cells, the polarization diversity detector output signals including for each photodetector cell a phase generated carrier signal having a modulation frequency ω and a sensor signal having an in-phase component I and a quadrature phase component Q superimposed on the phase generated carrier signal, comprising: a plurality of variable gain amplifiers arranged in corresponding relationship to the photodetector cells and arranged to produce a plurality of amplified signals; a feedback circuit connected to the plurality of variable gain amplifiers for controlling the gains thereof; and a plurality of demodulator circuits arranged to receive the amplified signals, the demodulator circuits being 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.