Signal equalizer in a coherent optical receiver

摘要

A signal equalizer for compensating impairments of an optical signal received through a link of a high speed optical communications network. At least one set of compensation vectors are computed for compensating at least two distinct types of impairments. A frequency domain processor is coupled to receive respective raw multi-bit in-phase (I) and quadrature (Q) sample streams of each received polarization of the optical signal. The frequency domain processor operates to digitally process the multi-bit sample streams, using the compensation vectors, to generate multi-bit estimates of symbols modulated onto each transmitted polarization of the optical signal. The frequency domain processor exhibits respective different responses to each one of the at least two distinct types of impairments.

主权项

1. A receiver for receiving an inbound optical signal through a link of an optical communications system, the inbound optical signal having been transmitted by a transmitter as a transmitted optical signal comprising a pair of orthogonal transmitted polarizations having a common carrier frequency, each transmitted polarization being modulated with symbols, the receiver comprising:
a polarization beam splitter configured to split the inbound optical signal into a pair of orthogonal received polarizations; a signal equalizer configured to generate estimates of the symbols modulated on each transmitted polarization by processing multi-bit digital sample streams of each of the received polarizations.