T114-JDSU.ppt

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1、LiveTrafficDispersion&DWDMTestingChallenges&InnovativeTestSolutionsApril,2011JDSUFiberOpticDivisionDarrylOtzen–TechnicalMarketingManagerAsiaPacificNewgenerationnetworks(ROADM,40G/100G)BringingnewtestchallengesIncreasingnumberofcascadedROADMsInROADMnetworks,eachc

2、hannelmaytraversedifferentroutes,opticalamplifiers,andadd/dropfilters,resultingindifferentperformancesforeachchannel(uncorrelatedtotheothers)Channelmeasurementscannolongerbededucedfromabroadbandmeasurement.NodeANodeBROADMNetworkROADMRouteperformancetesting:DGD,Sp

3、ectralanalysis,I-OSNRNewTestingRequirementsCharacterizeindividualDWDMchannelInpresenceoflivesignalsDoesnotnecessarilyfollowsamerouteasneighborsDoesnotcarrythesamebitrateormodulationformatIsnotcompensatedthesamewayTroubleshootindividualDWDMchannelIsolatefaultychan

4、nelwithoutdisturbingrunningneighborsLongtermmonitoringGiveaccesstothePMDofanopticalroutebycombiningmeasurementsfromseveralDWDMchannelsRequirements:UsingModulatedDataSignalasOpticalTestSignalODB/PSBTNRZ-OOKNRZ-DPSKRZ-OOKRZ-DPSKWavelength/WDMChannelUsingDWDMtransm

5、issionsignal(single-endedmeasurement)Doesnotinterruptdatatraffic,UsesmodulatedsignalasbroadbandlightsourceAnalysesDGDexperiencedbythesignalFrequencyrangeofSOPtraceislimitedbybandwidthofmodulatedsignalRxIn-BandPMD&OSNROpticalNetworkTxMeasurementPrinciplePolarizati

6、ondiversitycoherentreceiveranalysesthevariationofthestateofpolarization(SOP)ofreceivedsignalacrossacrossthebandwidthofthetransmittedsignal.EffectiveDGD(DGDEffective)iscalculatedfromangleofSOPvariationsonthePoincaréusingstringlengthcalculationqMeasurementPrinciple

7、PMDaffectsthestateofpolarization(SOP)ofthesignalsineachwavelengthchannelsothattheSOPvarieswithrelativeopticalfrequency,SOPvariationsareminimalwhenthesignalislaunchedinoneofthetwoprincipalstatesofpolarization(PSPs)ofthefiber,Variationsaremaximalwhensignalislaunche

8、dwithequalamplitudesinbothPSPs,andTofirstorder,theSOPvarieslinearlywithopticalfrequencyandtracesanarconthePoincarésphereThelengthofthisarcisproportionaltothedi