目录摘要.............................................................1Abstract.........................................................2前言.............................................................3第一章绪论....................................................41.1研究背景...................................................41.2偏振复用正交调制技术的发展及现状...........................41.3本文所作的工作.............................................5第二章偏振复用正交调制技术的理论基础............................62.1偏振复用技术相关理论简介...................................62.1.1偏振光的特性...........................................62.1.2偏振光在单模光纤中的传输...............................62.2正交调制技术相关理论简介...................................72.2.1QPSK调制原理..........................................72.2.2QPSK解调原理..........................................8第三章偏振复用系统中数字信号处理的研究.........................103.1偏振复用系统中的损伤和串扰................................103.1.1色散效应..............................................103.1.2偏振复用系统中的串扰..................................113.2数字信号处理算法研究......................................113.2.1色散补偿算法..........................................113.2.2解偏振串扰算法........................................133.2.3载波恢复..............................................14第四章偏振复用系统的仿真与分析................................164.1Optisystem软件简介.........................................164.2偏振复用系统模型的构建....................................174.2.1信号发送模块..........................................174.2.2光纤链路模块..........................................174.2.3信号接收模块..........................................184.2.4数字信号处理模块......................................194.2.5解码模块..............................................24第五章总结....................................................25参考文献致谢摘要随着近年来流量业务的高速增长，现有的光传输网络已不能满足需求，单信道100Gb/s及以上速率超高速长距离光传输系统是目前研究的热点。相比传统二进制启闭键控（OOK）调制技术，偏振复用正交调制（PDM-QPSK）技术可以提高四倍的传输速率。本文主要研究了单信道PDM-QPSK技术，并结合数字信号处理（DSP）的补偿技术提高性能，利用Optisystem软件搭建了完整的相干光纤通信系统模型，最终实现数据在光纤链路上以100Gb/s速率的可靠传输。本文首先介绍偏振复用和正交相移键控调制的基本原理，之后探讨了链路中不同损伤与串扰的成因，提出相应的数字信号理算法，即有限脉冲响应（FIR）数字滤波器的设计、恒模算法（CMA）、共轭M次方算法和M次方算法，以补偿链路损伤。最后利用Optisystem软件搭建模型并进行仿真，着重分析了算法中重要参数的影响。关键词：偏振复用；正交相移键控；相干光通信；数字信号处理算法AbstractWiththerapidgrowthoftrafficservicesinrecentyears,theopticaltransmissionnetworkswhichareexistingcannolonger-distanceopticaltransmissionsystemswithspeedsof100Gb/sandabovearecurrentlyhottopics.ComparedwiththetraditionalOn-OffKeying(OOK)Modulationtechnology,thePolarizationMultiplexingQuadraturephasemodulation(PDM-QPSK)technologyisfourtimesfasterthanit,andithasstronganti-interferenceperformance,soitissuitableforlong-distancetransmission.Inthispaper,thesingle-channelPDMtechnologyisstudied,andtheperformanceisimprovedbycombiningdigitalsignalprocessing(DSP)compensationtechniques.Acompletemodelofcoherentfiber-opticcommu...
