相干光纤通信系统对激光器线宽的要求  

Laser linewidth requirements for optical coherent coummunication systems

作　　者：刘继红[1] 张莹[1] 梁猛[1] 

机构地区：[1]西安邮电学院电子工程学院,西安710121

出　　处：《光通信技术》2011年第12期46-48,共3页Optical Communication Technology

基　　金：陕西省教育厅科技计划项目(11JK1006)资助

摘　　要：通过仿真相干光接收机载波相位估计性能,研究了采用不同调制格式时对所使用激光器线宽的要求,分析了16-QAM采用St ar和Square两种不同星座图时线宽要求差异的原因。仿真结果表明:对于既定的比特速率,采用高阶调制格式的系统降低了线路符号速率,但要求激光器线宽更窄;同一调制格式对激光器线宽的要求与所采用的星座图有关。In this paper, by simulating the performance of the carrier phase estimation for optical coherent receivers, the laser linewidth requirements are investigated for the optical coherent systems with different modulation formats, and the mechanism of diffenrence in laser linewidth requiremtent for Star and Square 16-QAM is discussed. The simulation results show that, for a given bit rate, higher-level modulation formats can lower the line symbol rate, while requiring the narrower laser linewidth. In addition, the optimization of constellation plays an important role when the laser linewidth is considered.

关 键 词：相干光通信 激光相位噪声 激光线宽 载波相位估计 

分 类 号：TN929.11[电子电信—通信与信息系统]