光纤通信课程设计课件Class2-03.pptx
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1、Class2Class2ChromaticdispersioneffectDispersioncompensatingtechniquesOptimizationofresidualdispersionoritsmap3SpectrumbroadeningDifferenceingroupvelocityWavelengthGroupvelocity1 11 10 0OriginalsignalTimeTransmitteroutputTimeReceiverinput1 11 11 1RegeneratedsignalWavelengthOpticalspectrumPulsebroaden
2、ing(Waveformdistortion)OpticalfiberTransmitteroutReceivedwaveformLowopticalpowerHighpowerintensityFrequencychirpRefractiveindexchangeWaveformdistortionduetochromaticdispersionOpticalfiberSpectrumbroadening40Gb/sopticalsignalTransmissionfiberPositivedispersion(Negativedispersion)+Negativedispersion(P
3、ositivedispersion)LongerwavelengthSlow(Fast)ShorterwavelengthFast(Slow)LongerwavelengthFast(Slow)ShorterwavelengthSlow(Fast)AfterfibertransmissionTransmitteroutput25psAfterdispersioncomp.Fiber#1DCDCFiber#2DistancekmR.D.ps/nmPost-comp.+-0Fiber#1DCDCFiber#2DistancekmR.D.ps/nmPre-comp.-+0Fiber#1DCDCFib
4、er#2DCDistancekmR.D.ps/nmPost-&Pre-comp.-+0Needtoconsiderthevariationoftoleranceduetocharacteristicsoftransmitter,fibernon-lineareffectsanddispersionmap.Evenifresidualdispersionvaluesaresame,thereceivedwaveformsaredifferent,affectedbytheseparameters.ParametersaffectingtothetoleranceSignalbitrateChan
5、nelcountsandspacingDistanceornumberofspansFibertypeFiberinputpowerPre-chirpingoftransmitter-Modulationschemeoftransmitter-DCFallocation/valueDistancekmDispersionps/nmDispersiontoleranceofreceiver-+-Dispersionps/nm+0PenaltydBLongerwavelengthShorterwavelengthCenterwavelengthAllowablepenaltyLight in an
6、 optical fiberslowly varying componentpolarizationcarrierTransverse field profile defined by modeThe nonlinear Schrdinger equation(NLSE)Fiber transmission-The Nonlinear Schrdinger EquationLaunched signal:C.R.Menyuk,IEEEJ.QuantumElectron.25,12,2674-2682,December1,1989.L.F.Mollenauer et al.,in Opt.Fib
7、er Telecommunications iVA,(Academic,San Diego,Calif.,1997).Fiber transmission NLSE general definitionsAttenuationDispersionNonlinearitya a-Loss coefficient km-1b b -dispersion coefficient ps2/kmg=2g=2p p n2/(l l Aeff)-nonlinear coefficient W-1km-1t=told z/vgto remove propagation delay-is the optical
8、 power WFiber transmission Renormalizing the lossesDefine:zLoss normalized NLSEFor simplicity of physical insight we may assume G(z)=1Chromatic dispersion or group velocity dispersion(GVD)“Positive”or“negative”dispersion depends on the definitionD 0 b b 0 “anomalous”dispersionD 0 “normal”dispersionp
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