Simultaneous phase noise mitigation and automatic phase/ frequency-locked homodyne reception is demonstrated for a 20–32 Gbaud QPSK signal. A phase quantization func- tion is realized to squeeze the phase noise of the signal by optical wave mixing of the signal, its third-order har- monic, 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 10−3.
|Mohajerin OL2016||1.85 MB|