Patent ID: 9692548
Date: 2017-06-27
CPC Classifications: H04B,H04J,H04L

Claim:
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; and performing a phase recovery; wherein the two-step polarization tracking process includes a first step and a second step; wherein the first step employs two different error calculation algorithms in parallel to produce estimated coefficients of a finite impulse response process having a first mean square error (MSE); wherein the second step inherits the estimated coefficients as an initial condition and updates the estimated coefficients for data recovery to obtain a second MSE that is lower than the first MSE; and wherein the phase recovery is performed during the two-step polarization tracking process using a hybrid binary phase search (BPS) and a maximum likelihood (ML) algorithm.