Patent ID: 6963675
Filing Date: 2005-11-08
Classification: G02F,H04B

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