Patent ID: 8521027

Claim:
A demultiplexer for demultiplexing multiple wavelength streams, comprising: a separator configured to separate the multiple wavelength streams into a first stream of wavelengths output from a first output of the separator and a second stream of wavelengths output from a second output of the separator, wherein the first output of the separator is coupled to a first input of a bi-directional multi-input port, multi-output port frequency demultiplexer and the second output of the separator is coupled to a second input of the bi-directional multi-input port, multi-output port frequency demultiplexer, the demultiplexer is in a photonic integrated circuit (IC), and a grating includes at least a first output port located at an opposite side of a grating with respect to the side where the first group of single wavelengths is input in the grating, and at least a second output port located at an opposite side of the grating with respect to the side where the second group of single wavelengths is input in the grating.