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1、第32卷第5期中国激光Vol.32,No.52005年5月CHINESEJOURNALOFLASERSMay,2005文章编号:0258-7025(2005)05-0668-05偏振模色散和时延抖动对啁啾光纤光栅色散补偿特性的影响刘峰,叶青,周赢武,李琳,瞿荣辉,方祖捷(中国科学院上海光学精密机械研究所,上海201800)摘要对存在偏振模色散(PMD)和群时延(GD)抖动的非理想线性啁啾光纤光栅的色散补偿特性进行了研究。实验测量了啁啾光纤光栅的群时延谱和偏振模色散光谱,理论分析和实验测量表明,啁啾光纤光栅差分群时延(DGD)抖动与其时延抖动密切相关。通过
2、数值模拟方法,计算了线性啁啾光纤光栅偏振模色散眼图代价与入射到啁啾光纤光栅色散补偿器的光信号的偏振方向的关系,计算结果表明在使用啁啾光纤光栅色散补偿器时应对光信号的偏振方向进行调整,以获得最佳补偿效果。另外结合实验数据,模拟计算并讨论了非理想线性啁啾光纤光栅群时延抖动和偏振模色散引起的信号的展宽和脉冲形状的劣化。关键词光通信;偏振模色散;色散补偿;啁啾光纤光栅中图分类号O436.3;TN929.11文献标识码AInfluenceofPolarizationModeDispersionandGroupTimeDelayRippleonDispersionC
3、ompensationbyChirpedFiberGratingLIUFeng,YEQing,ZHOUYin-wu,LILin,QURong-hui,FANGZu-jie(ShanghaiInstituteofOpticsandFineMechanics,TheChineseAcademyofSciences,Shanghai201800,China)AbstractInfluenceofpolarizationmodedispersion(PMD)andgrouptimedelayrippleofthechirpedfibergratingondisp
4、ersioncompensationwereinvestigatedinthispaper.Itisshownexperimentallythatrippleofpolarization-dependentdifferentialgroupdelay(DGD)hasverysimilarvariationbehaviorwiththerippleofgroupdelay(GD)intheirspectra,thoughtheformeramplitudeisabout40timeshigherthanthelater.Theminimumperiodof
5、therippleswasmeasuredtobe0.024nm.Asimplifiedtheoryisproposedtoexplainthesimilarityqualitatively.SimulationsshowthatPMDandDGDripplesbringharmfulinfluencetothedispersioncompensationusingthechirpedfibergratinginhigh-speedopticaltransmissionsystem.Therelationbetweentheincidentpolariz
6、ationdirectiontotheprincipalstatesofpolarization(PSP)andthepowerpenaltywascalculatedbothbyanapproximateformulaandnumericalsimulation.SimulationsoneyepatternsshowthatPMDofthelinearchirpedfiberBragggrating(FBG)lowerstheeffectivenessofitsdispersioncompensationandworsenstheperformanc
7、esofthecommunicationinlongertransmissionlength.Keywordsopticalcommunication;polarizationmodedispersion;dispersioncompensation;chirpedfibergratings[2][3]1引言色散补偿光纤、预啁啾等方法相比,啁啾光纤光随着高速大容量光通信的发展,如何使通信速栅由于其具有色散补偿量大、插入损耗小、成本低廉、控制灵活等诸多优点,表现出了许多优于其他补率和距离不断提高一直是科学工作者不断追求的目偿方法的特性,被认为在下一代高速密
8、集波分复用标。单信道容量的不断提升和密集波分复用[4](DWDM)技术的成熟,使
