Patent ID: 6167171
Filing Date: 2000-12-26
Classification: G02B,H04J

Abstract:
An optical wavelength division multiplexing device for demultiplexing a plurality of channels transmitted over an input optical fiber, the plurality of channels being divided into a first group and a second group, the first group and the second group each being composed of a plurality of channels which are distinct from the plurality of channels in the other group, the optical wavelength division multiplexing device comprising:a first wavelength division multiplexer having a first common port for receiving the plurality of channels from the input optical fiber, a plurality of first ports each transparent to a predetermined channel within the first group and reflective of other channels within the first group and all channels within the second group, and an output port transparent to all channels within the second group;a waveguide optically coupled to the output port of the first wavelength division multiplexer and transmitting the plurality of channels within the second group exiting the output port of the first wavelength division multiplexer;a second wavelength division multiplexer having a second common port for receiving the plurality of channels within the second group from the waveguide, and a plurality of second optical ports each transparent to a predetermined channel within the second group and reflective of other channels within the second group, the second common port being optically coupled to the waveguide.