偏振度方法跟踪偏振模色散性能的研究  

On Performance of Degree of Polarization Technique Used to Monitor Polarization-Mode Dispersion

作　　者：刘汉奎[1] 杨莉[1] 戚淮兵[1] 

机构地区：[1]西华师范大学物理与电子信息系,四川南充637002

出　　处：《西华师范大学学报（自然科学版）》2004年第2期152-155,共4页Journal of China West Normal University(Natural Sciences)

基　　金：国家自然科学基金资助项目(60271010)

摘　　要：采用琼斯和斯托克斯表示,基于主偏振态理论和一级近似,给出了光通信系统的信号偏振度与偏振模色散的关系式.运用MATLAB,评估了偏振度方法对40和80Gbps系统中的偏振模色散的跟踪性能.得出偏振度方法可以稳定地跟踪到1.5个位周期内的差分群延迟,具有良好的啁啾容许度.当脉宽指数为0.45时,对差分群延迟的跟踪上限高达2个位周期;在差分群延迟约为0.5个位周期时,跟踪灵敏度达到最大值.Using Jone′s and Stoke′s representations, an analytical expression of signal degree of polarization (DOP) relative to polarization-mode dispersion (PMD) for 'optical communication system is given, based on the principal state of polarization (PSP) theory and first-order assumption. The performances of DOP technique used to monitor PMD are evaluated for 40, 80Gbps communication system by MATLAB. It is concluded that DOP technique can monitor any value of differential group delay (DGD) within 1.5 bit period, and has good tolerance to pulse chirp. The limit of DGD monitored by DOP technique can be close to 2 bit periods if pulse width index equals to 0.45; the monitoring sensitivity will arrive to the top when DGD is about 0.5 bit period.

关 键 词：偏振度方法 偏振模色散 色散跟踪 光纤通信 差分群延迟 自适应补偿 

分 类 号：TN929.11[电子电信—通信与信息系统] O436.3[电子电信—信息与通信工程]