摘要
针对长距离相干光纤通信系统,提出了一种超大色散(CD)监测范围的两级自适应高精度色散估计算法。该算法利用信号功率自相关波形(ACSPW)函数作为粗估计,再使用恒模误差函数(CMA)中心值搜索,得到精确色散值。仿真结果表明,新算法色散估计误差小于35ps/nm,比传统ACSPW算法精度提高将近4倍;在参考误码率为10-2时,对比传统ACSPW算法,提出的算法功率罚改善8dB。
An adaptive and precise chromatic dispersion （CD） estimation algorithm with a large dispersion monitoring range is proposed based on a two-stage structure for long haul coherent optical communication systems. A coarse estimation of chromatic dispersion is obtained by employing the auto correlation of signal power waveform （ACSPW）. Afterwards, a precise CD value can be estimated by using the modified constant modulus （CMA） scheme. Simulation results show that the measured error value is less than 35 ps/nm by using the proposed algorithm, and the accuracy is improved about four-times compared to the conventional ACSPW algorithm. When the reference error rate is ^10-2 , the Dower oenalty compared to the ACSPW algorithm is improved by 8 dB.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第11期88-92,共5页
Acta Optica Sinica
基金
国家杰出青年基金(61325023)
国家自然科学基金(61335005)
关键词
光通信
相干光纤通信
自适应色散估计
自相关函数
恒模误差函数
communications
coherent optical communication
adaptive chromatic dispersion estimation
auto-correlation function
constant modulus algorithm
