Abstract

Simultaneous phase noise mitigation and automatic phase/frequency-locked homodyne reception is demonstrated for a 20–32 Gbaud QPSK signal. A phase quantization function is realized to squeeze the phase noise of the signal by optical wave mixing of the signal, its third-order harmonic, and their corresponding delayed variant conjugates, converting the noisy input into a noise-mitigated signal. In a simultaneous nonlinear process, the noise-mitigated signal is automatically phase- and frequency-locked with a “local” pump laser, avoiding the need for feedback or phase/frequency tracking for homodyne detection. Open eye-diagrams are obtained for in-phase and quadrature-phase components of the signal and 2  dB OSNR gain is achieved at BER 103.

© 2016 Optical Society of America

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