Soft decoding of data in a coherent optical receiver
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United States of America Patent
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Mar 21, 2017
Grant Date -
Jul 31, 2014
app pub date -
Mar 27, 2014
filing date -
Oct 29, 2009
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Abstract
In a coherent optical receiver receiving a polarization multiplexed optical signal through an optical communications network, a method of compensating noise due to polarization dependent loss (PDL). A Least Mean Squares (LMS) compensation block processes sample streams of the received optical signal to generate symbol estimates of symbols modulated onto each transmitted polarization of the optical signal. A decorrelation block de-correlates noise in the respective symbol estimates of each transmitted polarization and generating a set of decorrelated coordinate signals. A maximum likelihood estimator soft decodes the de-correlated coordinate signals generated by the decorrelation block.
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