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The performance of long-haul coherent optical fiber transmission system issignificantly affected by the equalization enhanced phase noise (EEPN), due tothe interaction between the electronic dispersion compensation (EDC) and thelaser phase noise. In this paper, we present a comprehensive study on differentchromatic dispersion (CD) compensation and carrier phase recovery (CPR)approaches, in the n-level phase shift keying (n-PSK) and the n-levelquadrature amplitude modulation (n-QAM) coherent optical transmission systems,considering the impacts of EEPN. Four CD compensation methods are considered:the time-domain equalization (TDE), the frequency-domain equalization (FDE),the least mean square (LMS) adaptive equalization are applied for EDC, and thedispersion compensating fiber (DCF) is employed for optical dispersioncompensation (ODC). Meanwhile, three carrier phase recovery methods are alsoinvolved: a one-tap normalized least mean square (NLMS) algorithm, a block-wiseaverage (BWA) algorithm, and a Viterbi-Viterbi (VV) algorithm. Numericalsimulations have been carried out in a 28-Gbaud dual-polarization quadraturephase shift keying (DP-QPSK) coherent transmission system, and the resultsindicate that the origin of EEPN depends on the choice of chromatic dispersioncompensation methods, and the effects of EEPN also behave moderately differentin accordance to different carrier phase recovery scenarios.

optik

Analysis of chromatic dispersion compensation and carrier phase recovery  in long-haul optical transmission system influenced by equalization enhanced  phase noise