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1、IEEEPHOTONICSTECHNOLOGYLETTERS,VOL.5,NO.10,OCTOBER19931241CompensationofPulseShapeDistortionDuetoChromaticDispersionandKerrEffectbyOpticalPhaseConjugationShigekiWatanabe,Member,IEEE,TerumiChikama,Member,IEEE,GeorgeIshikawa,TakafumiTerahara,andHideoKuwahara,Member,IEEEAbstract-Pu
2、lseshapedistortionduetochromaticdispersionOpticalphaseconjugatorandself-phasemodulationinasingle-modefiberwaseffectivelycompensatedforbyusinganopticalphase-conjugatewavegen-eratedbynondegenerateforwardfour-wavemixinginazero-dis-Wt)persionsingle-modefiber.Usingopticalphaseconjuga
3、tionatdthemidpointofa100-kmstandardsingle-modefibercompen-satesforthedistortionoflO-Gb/sintensity-modulatedNRZpulseataninputpowerlevelexceeding+10dBmwitha*z0L1L1+L2resultantpowerpenaltyoflessthan1.2dB.Fig.1.CompensationforwaveformdistortioninatransmissionlineusingOPC.I.INTRODUCT
4、IONINarecenthigh-intensityopticalcommunicationsys-L,,withapropagationconstantP1,andanonlineartemwithEr3+-dopedfiberamplifiers(EDFAs),therefractiveindexnZ1.Duringtransmission,thepulseispossibletransmissionlengthandcapacityarelimitedbydistortedduetogroupvelocitydispersion(GVD)andw
5、aveformdistortioninasingle-modefiber(SMF)causedSPM.Thephaseconjugatorthenconvertsthepulsetoabychromaticdispersionandtheself-phasemodulationphase-conjugatepulseEJt)havingopticalcarrierfre-(SPM)duetoopticalKerreffect[l].Amethodofdisper-quencywe(wavelengthA,),throughwhichaspectrumo
6、fsioncompensationbynonlinearopticalphaseconjugationthesignalpulseisinverted.Here,weassumetheconver-(OPC)hasbeenproposed121anddemonstrated[31,[4],insioncoefficiencyofthephaseconjugatorisconstantoverwhichdistortedpulseduetodispersioninthefirstfiberthespectralrangeoftheinputsignal.
7、E,([)isthencanbereshapedbythefollowingOPCandsubsequenttransmittedthroughSMF2oflengthL,,andwithapropagationthroughthesecondfiberwithsimilardisper-propagationconstantp2andanonlinearrefractiveindexsivecharacteristics.Usingthetime-reversecharacteristicsn22.Theresultantoutputsignalpu
8、lseiswrittenas[21ofaphase-conjugatewave,OPCcanc
