Open AccessFast and adaptive chromatic dispersion compensation scheme for digital coherent systems utilizing two-stage estimation
Author(s) -
Lin Jiang,
Yan Liu,
Anlin Yi,
Zhiyu Chen,
Yan Pan,
Wei Pan,
Bin Luo,
Guifang Li
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.016177
Subject(s) - polarization mode dispersion , phase shift keying , optics , polarization division multiplexing , dispersion (optics) , computer science , quadrature amplitude modulation , algorithm , multiplexing , physics , wavelength division multiplexing , electronic engineering , bit error rate , telecommunications , engineering , wavelength , decoding methods
A two-stage fast and adaptive chromatic dispersion (CD) estimation algorithm is proposed and demonstrated for coherent polarization-division-multiplexed (PDM) systems. The first stage uses signal power auto-correlation function for the coarse estimation while the second stage utilizes a modified constant modulus algorithm (MCMA) to obtain much more accurate accumulated CD. Simulation results show that the proposed algorithm is sufficient for CD estimation in non-dispersion-managed optical transmission of 112-Gb/s PDM-QPSK or 224-Gb/s PDM-16QAM signals. The concept is further experimentally verified in a 40-Gb/s PDM-QPSK system. Only ~7% estimation time is required to achieve similar accuracy compared to previous MCMA algorithm.