Patent ID: 7043099
Filing Date: 2006-05-09
Classification: G02F,H04B

Abstract:
1. A device comprising: an optical circulator having first, second, and third ports, said first port being supplied with signal light including first and second polarization components respectively having first and second polarization planes orthogonal to each other, and with pump light; a polarization beam splitter having fourth, fifth, and sixth ports, said fourth port being optically connected to said second port, said fourth and fifth ports being coupled by said first polarization plane, said fourth and sixth ports being coupled by said second polarization plane; and a polarization maintaining fiber having first and second ends, and having a polarization mode to be maintained between said first and second ends, said first end being optically connected to said fifth port so that said first polarization plane is adapted to said polarization mode, said second end being optically connected to said sixth port so that said second polarization plane is adapted to said polarization mode.