Patent ID: 8213799

Claim:
A planar lightwave circuit (PLC), comprising: a substrate; a demultiplexer disposed on the first substrate, the demultiplexer having an input and a plurality of outputs, the input configured to receive a wavelength division multiplexed (WDM) optical input signal having a plurality of channels, each of said plurality of channels corresponding to one of a plurality of wavelengths, each of the plurality of outputs configured to supply a corresponding one of said plurality of channels; a plurality of tunable filters disposed on the first substrate, each of the tunable filters coupled to a respective one of the plurality of outputs of the demultiplexer, such that a plurality of filtered channels are output from the tunable filters; and an optical processor disposed on the substrate and communicating with at least one of the plurality of tunable filters, the optical processor configured to receive one of the plurality of filtered channels and output a set of demodulated optical signal components, wherein the set of optical signal components is a first set of optical signal components, and the optical processor includes: a plurality of beam splitters configured to split each of the plurality of filtered channels into a second set of optical signal components; and a plurality of phase shifters and polarization rotators connected to the plurality of beam splitters, the phase shifters and polarization rotators configured to adjust a phase and a polarization of each of said second set of optical signal components and output said first set of optical signal components.