Multi-Stage Machine Learning Enhanced DSP for DP-64QAM Coherent Optical Transmission Systems

We propose to improve DSP for coherent-signal recovery with distributed multi-stage machine-learning algorithms. Experiments demonstrate more-than-3-dB and 1-dB improvements in OSNR sensitivities for 40-GBd and 60-GBd DP-64QAM at BER thresholds of 4.5×10
⁻³
and L6×10
⁻²
respectively.