The filter model is based upon an input optical signal formed as the sum of the Stokes vectors for each individual channel, transformed by the Mueller matrix that models the filter proper, resulting in an output optical signal that impinges on each photodiode. The results show that two- and three-channel systems can operate with a fixed-threshold comparator in the receiver circuit, but four-channel systems (and larger) will require channel coding of some form. For example, in the four-channel system, 10 of 16 distinct bit patterns are separable by the receiver. The model supports investigation of the range of variability tolerable in the fabrication of the on-chip polarization filters.
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Darko Ivanovich, Samuel B. Powell, Viktor Gruev, Roger D. Chamberlain, "Polarization division multiplexing for optical data communications," Proc. SPIE 10538, Optical Interconnects XVIII, 105381D (22 February 2018);