Open AccessJoint carrier phase and frequency-offset estimation with parallel implementation for dual-polarization coherent receiver
Author(s) -
Jianing Lu,
Xiang Li,
Songnian Fu,
Ming Luo,
Meng Xiang,
Huibin Zhou,
Ming Tang,
Deming Liu
Publication year - 2017
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.25.005217
Subject(s) - computer science , polarization division multiplexing , phase noise , frequency offset , offset (computer science) , laser linewidth , decoding methods , quadrature amplitude modulation , algorithm , optics , bit error rate , signal processing , laser , telecommunications , orthogonal frequency division multiplexing , physics , radar , channel (broadcasting) , programming language
We present dual-polarization complex-weighted, decision-aided, maximum-likelihood algorithm with superscalar parallelization (SSP-DP-CW-DA-ML) for joint carrier phase and frequency-offset estimation (FOE) in coherent optical receivers. By pre-compensation of the phase offset between signals in dual polarizations, the performance can be substantially improved. Meanwhile, with the help of modified SSP-based parallel implementation, the acquisition time of FO and the required number of training symbols are reduced by transferring the complex weights of the filters between adjacent buffers, where differential coding/decoding is not required. Simulation results show that the laser linewidth tolerance of our proposed algorithm is comparable to traditional blind phase search (BPS), while a complete FOE range of ± symbol rate/2 can be achieved. Finally, performance of our proposed algorithm is experimentally verified under the scenario of back-to-back (B2B) transmission using 10 Gbaud DP-16/32-QAM formats.