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Abstract

An optical receiver comprising an optical-to-electrical converter and a digital processor having first and second equalizer stages. The optical-to-electrical converter is configured to mix an optical input signal and an optical reference signal to generate a plurality of electrical digital measures of the optical input signal. The digital processor is configured to process the electrical digital measures to recover the data carried by the optical input signal. The first equalizer stage in the digital processor is configured to perform chromatic-dispersion-compensation processing in a manner that does not mix different electrical digital measures prior to signal-equalization processing in the second equalizer stage, which enables the first equalizer stage to operate using real-valued arithmetic. These characteristics of the first equalizer stage enable the second equalizer stage to more-effectively mitigate signal impairments for signals received through CD-impaired optical-transport links because various orthogonality-degrading effects can now be tracked and compensated more accurately therein.

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First Claim