光子学报, 2011, 40 (12): 1893, 网络出版: 2012-01-04
相干光正交频分复用传输系统中的无导频相位纠偏方法
Carrier Phase Recovery Without Pilot Sub-carriers in Coherent Optical OFDM Transmission Systems
正交频分复用 载波相位估计 正交振幅调制 Orthogonal Frequency Division Multiplexing (OFDM) Carrier phase estimation Quadrature Amplitude Modulation (QAM)
摘要
提出了一种适用于16-QAM的新型相位纠偏方法，克服了基于M次方算法的传统相位纠错方法不适用于高阶正交振幅调制的缺点.该方法结合正交频分复用调制方式，无需导频即可完成相位盲估计，且计算量较少.本文基于112 Gb/s 1 040 km的相干光正交频分复用传输系统进行了算法验证，并与传统的4次方纠偏方法进行了比较，实验证明该算法适用于正交频分复用和16-QAM调制平台，相位纠偏结果显著优于基于导频的4次方算法.
Abstract
Aiming at the shortcoming that the M-th power based traditional phase recovery method cannot be used for high-order QAM signal constellations, a carrier phase recovery method for 16-QAM constellations is presented. The proposed method is able to applied in CO-OFDM system to implement blind phase recovery with low computational cost. In the verification experiment, the method is used in 112 Gb/s 1 040 km CO-OFDM transmission, and its performance is compared to those using the fourth-power estimator. Experimental results indicate that the proposed method significantly outperform the fourth-power estimator.
刘武, 杨奇. 相干光正交频分复用传输系统中的无导频相位纠偏方法[J]. 光子学报, 2011, 40(12): 1893. LIU Wu, YANG Qi. Carrier Phase Recovery Without Pilot Sub-carriers in Coherent Optical OFDM Transmission Systems[J]. ACTA PHOTONICA SINICA, 2011, 40(12): 1893.
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