TECHNIQUES FOR BLIND EQUALIZATION OF HIGH-ORDER QUADRATURE AMPLITUDE MODULATION SIGNALS

摘要

A blind equalization technique of high-order QAM signals is provided. A method implemented at a receiver-side in an optical communication network receives an optical signal and performs a two-step polarization tracking process on the received optical signal. Using another method, a polarization multiplexed optical transmission is received by a receiver and a polarization tracking process is performed by applying two different algorithms in parallel. One algorithm may be a decision directed least means square (DD-LMS) algorithm. Another algorithm may be a constant modulus algorithm (CMA).

主权项

1. A method of optical communication, implemented at a receiver-side in an optical communication network, comprising:
receiving a polarization multiplexed optical signal; and performing a two-step polarization tracking process on the received optical signal to recover data carried by the polarization multiplexed optical signal; wherein the two-step polarization tracking process includes a first step and a second step; and wherein the first step produces estimated coefficients of a finite impulse response process; and wherein the second step uses the estimated coefficients for data recovery.