Experimental Evaluation of Channel Number Dependency in Vector-Domain Signal Quality Equalization to Mitigate Core-to-Core Q-Difference for SDM Transmission

The channel number dependency of vector-domain signal quality equalization is evaluated to mitigate core-to-core $Q$-difference for SDM transmission experimentally. As increasing of channels from 2 to 4, the $Q$-improvement of the worse channel is enhanced from 1.2 to 2.5 dB.