Electronic compensation of cross-phase modulation
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United States of America Patent
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-
Jan 12, 2016
Grant Date -
Sep 25, 2014
app pub date -
Dec 19, 2011
filing date -
Dec 22, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An optical signal (116) is modulated with a transmitted electrical signal comprising an information-bearing component (122) and a pilot tone (120) having a predetermined frequency. Transmission of the signal results in distortion, including nonlinear optical transmission impairments. A method of receiving the signal includes detecting the optical signal to produce a received electrical signal (X) comprising a distorted variant of the transmitted electrical signal. The pilot tone is extracted from the received electrical signal using a filtering operation (308) having a predetermined characteristic, and a compensation signal determined based upon the extracted pilot tone. The compensation signal is applied to the received electrical signal (X) to produce a compensated signal (Y) having reduced distortion. The predetermined characteristic of the filtering operation (308) is represented by one or more parameters having values selected so as to substantially maximize a measure of quality of the compensated signal.
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