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Polarization-compatible receivers are indispensable in transceivers used forwavelength division multiplexing (WDM) optical communications, as lightpolarization is unpredictable after transmission through network fibers.However, the strong waveguide birefringence makes it difficult to realize apolarization-independent wavelength demultiplexer in a silicon photonic (SiPh)receiver. Here, we utilized the birefringence effect for simultaneouslydemultiplexing wavelengths and polarizations, and experimentally demonstrated anovel polarization-independent wavelength demultiplexer with a single device ona SiPh platform. The principle was validated on an etched diffraction grating(EDG), which successfully split the arbitrarily polarized light containing fourwavelengths into eight channels with single-polarization and single-wavelengthsignals. Polarization-dependent losses of 0.5-1.8 dB, minimum insertion loss of0.5 dB, and crosstalks lower than -30 dB were experimentally measured. Thus, apromising general solution was developed for implementingpolarization-independent WDM receivers and other polarization-independentdevices on SiPh and other platforms with birefringent waveguide devices.

Polarization-Independent Wavelength Demultiplexer Based on Single Etched Diffraction Grating Device