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FiberOpticNetworkDesignX.Wu,M.J.Li,H.M.YanDept.ofOpt.Engr.,ZJU2011Class3Outline
ChromaticdispersioneffectDispersioncompensatingtechniquesOptimizationofresidualdispersionoritsmap010011timefcarrierfreq.ViVjVkFourier?InformationBandwidthofData?TemporalSpreadingf(distance,(bitrate)2)(ps/nm)/kmtimeFibertimePhotonVelocity(f)=SpeedofLightinVacuumIndexofRefraction(f)SignalDegradation
ControlPacket(C.P.),notpayload,isregeneratedateverynodeC.P.haslowerbit-rate(C.D.effect(bit-rate)2)ThereishigherchanceforpayloadtobedegradedNodeNodeNodeNodettttPayloadC.P.EffectonPayloadandControlPacketPolarization-mode-dispersion(PMD)Polarizationdependentloss(PDL)Degradationbasedonnon-catastrophiceventsRandompolarizationcouplingStatisticallyvarieswithtimeBit-rateandwavelengthdependentPolarizationstategenerallyunknownandwandersPMDImpairmentcrosssectionEllipticalFiberCoresideview
PMDinducesrandomlychangingdegradations.Criticallimitationat
10Gbit/spayloaddatarates.The2polarizationmodespropagateatdifferentspeeds.1st-orderPMD=DGDPMD(A)(B)DGDPMDCausesandStatisticalEffectHowmanysegmentswillbeenoughtoemulatePMD?Ans.=~12PoincareSphere&PrincipleStateofPolarizationPrincipleStateofPolarizationProved1986BellLabsC.D.Poole&R.E.WagnerTwoPSPperpendiculartoeachotherindependentofwavelengthtothefirst-orderPSPinPoincareSphere&PrincipleStateofPolarization球面上的每一個(gè)點(diǎn)都代表了一種橢圓偏振態(tài),在兩極演化為右旋、左旋圓偏振光,在赤道退化為線偏振光,北半球?yàn)橛倚駪B(tài),南半球?yàn)樽笮駪B(tài)。所以,偏振光在光纖傳輸過(guò)程中的任意偏振態(tài)的變化都可以表示成邦加球上的某一條運(yùn)動(dòng)軌跡
PMDtemporalchangesmorerapidlywiththefiberlengthandaverageDGDFrequencyofoccurrenceinducedbyPMDfluctuationTimeSpan(ms)Occurrence52kmfiber<>=2.8ps(b)FastFluctuation
Mechanicalvibrations:millisecondstominutesH.Bulow,etal.,OFC1999TimeRateofPMDChangePMD(ps)1.52.02.5101418Temp.(C)Time(min)040080048.8kmburiedcable(a)SlowFluctuation
PMDvariationsduetotemperaturechanges:hourstodaysJ.Cameron,etal.,OFC1998PMDMonitoringTechniquesRequireshigh-speeddevices(demonstratedfor160Gb/sRZsignal)Affectedbyotherdistortionsources+CanbeintegratedwithelectronicequalizationA.EyeopeningmeasurementB.RFspectrumanalysis
+Nohighspeedelectronics+DependsonlyonPMD+Bit-rateindependent+UnaffectedbyotherdistortionsourcesPulse-widthdependentC.
Degreeofpolarization(DOP)measurement+SimpleAffectedbyotherdistortionsourcesSensitivityandDGDrangedependsonmonitoredfrequencyPMDonaninstalledfiberlinkGoalTogainanunderstandingofthetemporalandspectralcharacteristicsofPMDonaninstalledfiberlink.ApproachMakelong-termmeasurementsofthedifferentialgroupdelay(DGDor)overarangeofwavelengthsandassessitsratesofchangewithtimeand.DesiredoutcomeProvidenetworkoperatorswithknowledgetoevaluatetechniquesformitigatingPMD-inducedoutageswhenchanneldataPCforRemoteControl&DataStorageTunableLaserSource(TLS)(1510–1625nm)Dl=0.1nmPolarizationAnalyzer(PA)(JonesMatrixEigenAnalysis)InstrumentController
Fiberloopback:95-kmspan
ofslotted-core,directburiedfiber-opticcablemadeavailablebySprint.Over86days(fromNovember9,2001thruFebruary2,2002)692measurementsweremadeonthe1150discretewavelengths.Measurementswererepeatedaboutevery3hours.PMDCharacterization86daysofdata795,800dataptsObservationsDGDdependsonbothtimeand.DGDvariesslowlywithtime.DGDvariesrapidly
with.InstancesofhighDGDarespectrallylocalized.PMDcharacterization:DGDvs.landtimePMDcharacterization:Probabilitydensityfunction
ObservationsMeasureddatashowgoodagreementwithMaxwelliandistribution.ThereisalowprobabilityofhighDGDevents(i.e.,DGD>3meanDGD).Theoreticalresultsfromoutagemodel:RxThreshold 3<DGD> 3.7<DGD>Span1MTBO 6.39years 1648years!!!Outageduration136minutes 108minutesMTBOs:meantimebetweenoutagesPMDcharacterization:resultsandconclusionsFiberSim:
SMF/LeafComparison75km75km10Gb/sperchannel25channels75kmDCF/EDFADCF/EDFA...DCF/EDFARxTxDifferentFibers:
EyeDiagramsvs.Distance@75km@450km@750km@1050kmSSMFLinkNZDSFLinkCompensationConfigurationsOutputInputSqueezers(00)Squeezers(450)OpticalFiberABCDEPMFEfficientopticalmodulationformats:WDM+SCMOpticalMUXAdd/dropTransmitter1f1Sf2ch.2fnch.n..l1LDch.1lml1f1Sf2ch.2fnch.n..Receiver1ch.1OpticalDMUXf1Sf2ch.2fnch.n..Receivermch.1Transmittermf1Sf2ch.2fnch.n..lmch.1LDEfficientopticalmodulationformats:
CombatPMD-inducedsignalfading
usingdiversitySCMreceiverTxPolarizationcontrollerRFdetectionSLPFAmp.ControlalgorithmTodecisioncircuitSpliterPBSRFdetectionPD1(b)P
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