Patent ID: 7239768
Filing Date: 2007-07-03
Classification: G02B,G02F,H04B

Abstract:
1. A integrated optical circuit, comprising: an interferometer having a first optical path and a second optical path configured for regenerating an input signal entering said first path by interference at a first coupler between continuous wave (CW) signals from said two optical paths; means for canceling, at a second coupler, a traveling signal from said first path; wherein said means for canceling comprises a third optical path configured such that a signal passing therethrough and said traveling signal from said first path meet at said second coupler, said signal passing therethrough and said traveling signal having a same amplitude and a destructive phase difference therebetween; wherein each of said three optical paths is coupled to a respective phase shifter; wherein each said phase shifter is a semiconductor optical amplifier (SOA); wherein drive currents of said SOAs coupled in said first and third paths are tuned such that said destructive phase difference at said second coupler is realized; and wherein said SOAs in said first and third paths are operated under a saturation condition.