Patent ID: 6144784
Filing Date: 2000-11-07
Classification: G02B,H04J

Abstract:
An optical I/O module adapted to be inserted in a transmission line through which first signal light including one or more wavelength components propagates, said optical I/O module constituting a part of said transmission line and having input and output terminals for allowing said first signal light propagating through said transmission line to be inputted and outputted, said optical I/O module comprising:a first light-reflecting device reflecting a part of said wavelength components included in said first signal light; anda first directional coupler having a first port device optically connected to said input terminal, a second port device optically connected to said output terminal, and a third port device optically connected to said first light-reflecting device;wherein said first signal light from said input terminal captured via said first port device is guided to said first light-reflecting device by way of said third port device, and a reflected component from said first light-reflecting device captured via said third port device is guided to said output terminal by way of said second port device.