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Abstract-A method for designing polarization independent phased-array wavelength demultiplexers, using different array orders for TE and TM, is described and analyzed with respect to fabrication variations. Flattening of the wavelength response is shown to improve fabrication tolerances. A four channel phased-array wavelength demultiplexer with at least 0.2 nm of polarization independent flattened response for each channel (spacing 1 nm) bas been made with an insertion loss of 1.5-3 dB and a crosstalk of -17 to -19 dB.

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Abstract-A 4-channel phased-array wavelength division demultiplexer with 1.8 nm channel spacing at 1.54pm has been monolithidy integrated with photodetedors in WhGaAsP.On chip losses are 3.5 to 4.5 dB. These are the lowest losses reported so far for demultiplexers monolithically integrated with photodetectors. Nearest neighbor crosstalk ranges from -12 to -21 dB.