Precise and Wideband Compensation of Inter-Channel Cross-Phase Modulation Noise in WDM Coherent Transmission Using Injection Locking

We demonstrate the precise compensation of inter-channel XPM based on injection locking. The BERs improved from 5×10
^-3
to 2×10
^-3
in a 60-ch, 3 Gbaud PDM-256 QAM-160 km transmission with a spectral efficiency of 10.3 bit/s/Hz.