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An optical signal level swapping function and a multi-level amplitude noise mitigation method are proposed using three parametric gain regions. Experiments demonstrate less than 1% EVM-penalty for swapping and multi-level amplitude noise mitigation is achieved.
We experimentally demonstrate tunable phase-noise mitigation and automatic frequency/phase locking to a “local” pump laser for a 20–32 Gbaud QPSK homodyne receiver using nonlinear optical signal processing. For the input noisy signal, open eye-diagrams are obtained for in-phase and quadrature components and ∼2 dB OSNR gain is achieved at BER 10−3.
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