Detection and removal of cycle slip from received signals

摘要

Embodiments of the disclosure include a method and apparatus for detecting and removing cycle slip. A phase-modulated signal having a plurality of phase-modulated symbols is received at an optical receiver, and, for each phase-modulated symbol, a phase-error estimate of a phase error of the phase-modulated symbol is generated. The presence of a cycle slip is then detected based on the phase-error estimates, and, a phase of each of one or more of the received phase-modulated symbols is adjusted to remove the detected cycle slip without adjusting a local oscillator.

主权项

1. A method comprising:
(a) receiving, at an optical receiver, a signal comprising a plurality of phase-modulated symbols; (b) generating, for each phase-modulated symbol, a phase-error estimate of a phase error of the phase-modulated symbol; (c) detecting presence of a cycle slip based on the phase-error estimates; and (d) adjusting a phase of each of one or more of the received phase-modulated symbols, downstream of a local oscillator of the receiver, to remove the detected cycle slip without adjusting the local oscillator; and wherein, in step (c), the cycle slip is detected by comparing a current block of the phase-error estimates to one or more previous blocks of the phase-error estimates.