Simplified polarization mode dispersion equalization

摘要

Methods, systems, and devices are described for equalizing data from an optical signal. Samples are filtered with at least one filter to compensate for polarization mode dispersion in an optical path. The filtered samples may be used to determine errors based on a difference between a radius of a recovered symbol and a target radius. A parameter may be assigned to one or more of the errors and properties of the at least one filter may be updated based on the assigned parameters. The parameter may be assigned from a small set of parameters based on at least one threshold value. Outputs generated from the filtered samples may also be assigned a parameter from a different set of parameters. The parameter assigned to the output may be used to update the particular set of taps of the at least one filter from which the output was generated.

主权项

1. A method for equalizing data communicated via an optical path, comprising:
receiving, by a receiver device, a sampled signal comprising horizontal in-phase/quadrature (I/Q) samples and vertical I/Q samples; generating, by a horizontal polarization equalizer, filtered horizontal I/Q samples by:
filtering the horizontal I/Q samples and the vertical I/Q samples with a horizontal polarization filter to obtain the filtered horizontal I/Q samples;determining first errors from the filtered horizontal I/Q samples based on differences between radii of recovered symbols of the filtered horizontal I/Q samples and a target radius;assigning first parameters to one or more of the first errors; andupdating the horizontal polarization filter based on the first parameters assigned to the one or more of the first errors; and generating, by a vertical polarization equalizer, filtered vertical I/Q samples by:
filtering the horizontal I/Q samples and the vertical I/Q samples with a vertical polarization filter to obtain the filtered vertical I/Q samples;determining second errors from the filtered vertical I/Q samples based on differences between radii of recovered symbols of the filtered vertical I/Q samples and the target radius;assigning second parameters to one or more of the second errors; andupdating the vertical polarization filter based on the second parameters assigned to the one or more of the second errors, wherein the horizontal polarization equalizer comprises a first hardware partition of the receiver device and the vertical polarization equalizer comprises a second, different, hardware partition of the receiver device.