title: Fast and adaptive chromatic dispersion compensation scheme for digital coherent systems utilizing two-stage estimation.
abstract: 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.
authors.forename: Lin
authors.initials: L
authors.lastname: Jiang
authors.forename: Lianshan
authors.initials: L
authors.lastname: Yan
authors.forename: Anlin
authors.initials: A
authors.lastname: Yi
authors.forename: Zhiyu
authors.initials: Z
authors.lastname: Chen
authors.forename: Yan
authors.initials: Y
authors.lastname: Pan
authors.forename: Wei
authors.initials: W
authors.lastname: Pan
authors.forename: Bin
authors.initials: B
authors.lastname: Luo
authors.forename: Guifang
authors.initials: G
authors.lastname: Li