基于幅度估计的光相干检测增强方法  

The enhancement of optical coherent detection by amplitude estimation

作　　者：陈彬[1] 张胜利[1] 程凌浩[2] 李朝辉[2] 王晖[1] 崔石[3] 

机构地区：[1]深圳大学信息工程学院,深圳518060 [2]暨南大学光子技术研究所,广州510632 [3]中国科学院高能物理研究所计算中心,北京100049

出　　处：《深圳大学学报（理工版）》2011年第2期161-164,共4页Journal of Shenzhen University(Science and Engineering)

基　　金：教育部留学回国人员科研启动基金资助项目(教外司留[2009]8);深圳大学科研启动基金资助项目(200865)~~

摘　　要：研究增强光相干接收中的幅度估计方法.利用传统平衡接收方法中被抵消的功率信息进行幅度估计,提高QAM信号检测准确性.仿真结果表明,该方法与传统平衡接收方法相比,在接收16QAM和64QAM的调制信号时,两者均可增加1 dB左右的信噪比容限.In optical coherent communication systems,balanced photodetectors were typically employed.Such photodetectors preserved the product of the received optical signals and the local oscillators（LO） for detection but cancelled out the power of both.A new detection scheme which aims to maintain the full information obtained from the photodetectors was proposed.Not only the product of the signals and the LO but also the power of signals were used to estimate the amplitude of the target signals.For 16-qudrature-amplitude-modulation（16-QAM） and 64-QAM signals,the simulation results show that the new scheme can outperform the conventional balanced detection method by more than 1 dB in SNR.

关 键 词：通信技术 相干光通信 相干接收 正交幅度调制 相移监控 

分 类 号：TN929.11[电子电信—通信与信息系统] TN929.13[电子电信—信息与通信工程]