256-Gb/s single-carrier PM-256QAM implementation using coordinated DD-LMS and CMA equalization

Abstract
Signal-carrier PM-256QAM generation at record-breaking line rate of 256 Gb/s and its point-to-point transmission over 20-km SMF are experimentally demonstrated, which is enabled by using a fast-converging polarization-tracking equalizer with coordinated CMA and DD-LMS algorithm.