摘要
针对相干光纤通信系统中32Q-AM调制格式,提出了一种在第一级使用准QPSK分割的算法来替代传统的QPSK分割的改进相位估计算法。仿真结果显示,在1dB信噪比劣化的情况下当误码率达到1E-2时,该算法相对于传统的QPSK分割算法的激光器线宽带来的相位噪声的容忍度提高了85%。通过与精细的估计算法级联可以获得最大激光器线宽容忍度为5.1E-5。
In this paper, a quasi quadrature phase shift keying (QPSK) partitioning method is proposed to replace the conventional QPSK partitioning method in the first stage of the carrier phase estimation (CPE) algorithms for the 32-QAM coherent optical syste^m. By simulation, for 1 dB SNR penalty at bit error rate (BER) of 1E-2, the proposed method can achieve an improving of 85% for combined linewidth symbol duration product tolerance compared with conventional method for single stage. Combined with the fine stage, the maximum tolerable combined linewidth symbol duration product can be up to 5.1E-5.
作者
辛鹏
李海涛
李垠韬
袁卫国
韩纪龙
安慧蓉
雷学义
黄丽艳
XIN Peng LI Haitao LI Yintao YUAN Weiguo Plan Jilong AN Huirong LEI Xueyi HUANG Liyan(China Electric Power Research Institute, Beijing 102401, China Accelink Technologies Co., Ltd., Wuhan 430205, China Wuhan Research Institute of Post and elecommunications, Wuhan 430074, China State Grid Jibei Electric Power Company, Beijing 100053, China State Grid Information and Telecommunication Brand, Beijing 100761, China)
出处
《光通信技术》
北大核心
2017年第2期9-12,共4页
Optical Communication Technology
关键词
相干光通信
32-QAM
载波相位估计
相干检测
数字信号处理
coherent optical communication system
32-QAM
carrier phase estimation
coherent detection
digital signal processing