Tb/s量级单载波相干光纤通信系统偏振模色散影响分析  

Analysis of the influence of polarization mode dispersion on Tb/s single-carrier coherent fiber optical communication systems

作　　者：钟昆 曾陈萍 董加强[1,2] 王宝江 何龙科[1,2] 李丹 ZHONG Kun;ZENG Chenping;DONG Jiaqiang;WANG Baojiang;HE Longke;LI Dan(School of Information Technology,Xichang University,Liangshan,Sichuan 615013,China;Key Laboratory of Liangshan Agriculture Digital Transformation of Sichuan Provincial Education Department,Xichang University,Liangshan,Sichuan 615013,China)

机构地区：[1]西昌学院信息技术学院,四川凉山615013 [2]西昌学院凉山农业数字化转型四川省高等学校重点实验室,四川凉山615013

出　　处：《光电子.激光》2025年第3期317-323,共7页Journal of Optoelectronics·Laser

基　　金：凉山智慧农业传感技术研发实验室(015/117236000);西昌学院博士科研启动项目(YBZ202107);应用于智慧农业的光纤传感技术研究团队(015/117279029)资助项目。

摘　　要：在超高速相干光纤通信系统中,单载波信号速率的提升通常被认为是波分复用(wavelength division multiplexing,WDM),乃至整个通信系统速率提升的基础。而在单载波速率提升的过程当中,偏振模色散(polarization mode dispersion,PMD)被认为是制约光纤通信系统速率提升的最重要因素之一。进行相应的PMD仿真运算,一方面有望提供PMD角度的解决方案来突破速率;另一方面可为后续Tb/s速率实验和商业应用打下良好的基础。本文由此从误差矢量幅度(error vector magnitude,EVM)和误码率(symbol error ratio,SER)的角度定量分析了单载波速率Tb/s量级时,一阶、二阶及更高阶、全阶PMD对相干光纤通信系统的影响。其次,分别进行了恒模算法(constant modulus algorithm,CMA)对一阶、二阶及更高阶、全阶PMD补偿的分析。最后,计算了三种情况的PMD中,CMA算法的最优抽头数值。结果表明,只含一阶、二阶及更高阶PMD时系统的光信噪比(optical signal-to-noise ratio,OSNR)容限值可分别改善6.7 dB和6 dB。单载波速率为1.2 Tb/s时,CMA算法对二阶及更高阶PMD的补偿效果要优于一阶PMD,且最优抽头数在三种情况下各不相同。In ultra-high speed coherent fiber optical communication systems,the improvement of single-carrier signal rate is usually considered as the foundation for rate improvement of wavelength division multiplexing(WDM)and even the entire communication system.During the process of single-carrier rate improvement,polarization mode dispersion(PMD)is considered to be one of the most important factors restricting the rate improvement of fiber optical communication systems.Conducting corresponding PMD simulation calculations is expected to provide PMD solutions for breakthrough rates on the one hand;On the other hand,it can lay a good foundation for subsequent Tb/s rate experiments and commercial use.This article quantitatively analyzes the impact of first-order,second-order and higher-order,full-order PMD on coherent fiber optical communication systems at the single-carrier rate of Tb/s level from the perspective of error vector magnitude(EVM)and symbol error rate(SER).Secondly,the constant modulus algorithm(CMA)is analyzed for first-order,second-order and higher-order,full-order PMD compensations.Finally,the optimal tap numbers of the CMA algorithm are calculated for three cases of PMD.The results show that the optical signal-to-noise ratio(OSNR)tolerance limit of the system can be improved by 6.7 dB and 6 dB,respectively,when only the first-order,second-order and higher-order PMD is included.When the single-carrier rate reaches 1.2 Tb/s,the compensation effect of the CMA algorithm for second-order and higher-order PMD is better than first-order PMD,and the optimal tap numbers are different in three cases.

关 键 词：相干光纤通信 偏振模色散(PMD) 恒模算法(CMA) 单载波Tb/s量级 

分 类 号：TN913.7[电子电信—通信与信息系统]