Transceiver polarization power imbalance compensation and monitoring for coherent digital subcarrier modulation system

A transceiver polarization power imbalance compensation and monitoring scheme using frequency pilots for coherent digital subcarrier modulation system is proposed and demonstrated experimentally. The experimental results show that transceiver polarization power imbalance only reduces the signal-to-noise ratio in one polarization, but has little effect on performance of the polarization demultiplexing algorithm with the proposed scheme. In addition, the polarization power imbalance of the transceiver can be monitored simultaneously using frequency domain pilots.