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ID:48198266
大小:3.21 MB
页数:35页
时间:2020-01-15
《光电子材料导论 非线性光学.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、信息传输材料与技术---传输非线性Increasethetransmissioncapacityofadense-wavelength-division-multiplexing(DWDM)system:increasethetransmissiondatarateperwavelengthchromaticdispersionpolarization-modedispersionnonlinearity信息传输材料与技术---传输非线性increasethenumberofwavelengthswhilekeepingpropert
2、ransmissiongranularity.optical-nonlinearity-inducedsystemlimitations:XPM,SPM,FWMThreefundamentallimitingfactorsinU-DWDMSystemsinclude:1)variousrandomnoiseterms;2)fiberchromaticdispersion-inducedintersymbolinterference(ISI);3)optical-nonlinearity-induceddistortionandinterf
3、erence.MLMLaserSpectralOutputtypicalopticaloutputspectrumofanMLMlaserandthecorrespondingRMSspectralwidth.DispersionwithaNormalDFBLaserPolarizationModeDispersion(PMD)Polarizationmodedispersion(PMD)isanothercomplexopticaleffectthatcanoccurinsingle-modeopticalfibers.Single-m
4、odefiberssupporttwoperpendicularpolarizationsoftheoriginaltransmittedsignal.Figure1.Realfiberislikemanyretardationplatesinserieswithdifferentorientationsandbirefringence.Itisequivalenttoasingleretardationplatehavingslowandfastaxes,andaneffectivebirefringence.Anopticalpuls
5、ebroadensbecausethetwopolarizationcomponentstravelwithdifferentspeeds.(a)GeneralU-DWDMsystemmodel.(b)PeriodicallyamplifiedU-DWDMsystemmodelwithpostdispersioncompensationineveryamplifierstage.thenonlineareffectshavebecomeevenmoreimportantsincethedevelopmentofEDFAandWDMsyst
6、ems.Theoriginofthenonlinearitiesistherefractiveindexoftheopticalfiber,varywiththeintensityofopticalsignal.Althoughtheindividualpowerineachchannelmaybebelowthelevelneededtoproducenonlinearities,thetotalpowersummedoverallchannelscanquicklybecomesignificant.Thecombinationofh
7、ightotalopticalpowerandlargenumberofchannelsatcloselyspacedwavelengthsisasourceformanykindsofnonlinearinteractions.Thenonlineareffectscanbedividedintotwocategories.duetheinteractionoflightwaveswithphonons.ItcontainstwoimportantnonlinearscatteringeffectsSRSandSBS.Theeffect
8、sthatarerelatedtotheKerreffect,theintensitydependenceonthenonlinearrefractiveindexoftheopticalfi
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