Effect of carrier phase estimation for 111Gbit/s POLMUX-RZ-DQPSK equalization in presence of 10.7Gbit/s OOK neighbours

We optimize carrier phase estimation (CPE) to increase the XPM tolerance of 111-Gb/s POLMUX-RZ-DQPSK in the presence of 10.7-Gb/s OOK neighbours transmitted over an 1140 km EDFA-only link.