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首页 学术会议海报模板2

学术会议海报模板2.ppt

学术会议海报模板2

小虾
2014-02-17 0人阅读 举报 0 0 暂无简介

简介:本文档为《学术会议海报模板2ppt》,可适用于其他资料领域

Figure:Reflectionpatternsusingvariousconnectors(reducedFresnelmagnitudesinsideyellowbox)IntroductionOpticalTimeDomainReflectometry(OTDR)isacommontechniquefordetectingdamageinfiberopticcablesTheprocessinvolvestransmittingapulseoflightdowntheopticalfiber,analyzingtheamountoflightreflectedbacktothesource,anddisplayingthereflectionpatternsontheOTDRscreenConnectorTypeTheindexofrefractionofthepatchvsthetestfiberwasalloweddifferbyupto,whichcreatedamismatchatthejunctionofthetwofibersFourtypesofconnectorsweresimulatedtodeterminewhichproducedthelowestreflectionmagnitudePlottingthereflectionresponsepatternsfromallfourconnectiontypesshowsthattheAngledPhysicalContactconnectorproducedthelowestreflection(seeFigure)Thoughmuchlessexpensive,IndexMatchingFluidonlyhasalifetimeofyearsMostopticalfiberapplicationsrequireyearslifeormoreReferencesSadiku,NOMatthewNumericalTechniquesinElectromagneticsNewton,StevenANovelApproachestoOpticalReflectometryKnapp,JohnCharacterizationofFiberOpticCablesUsinganOpticalTimeDomainReflectometer(OTDR)FiberopticcharacterizationusingasimulatedOpticalTimeDomainReflectometer(OTDR)RobbPMerrillDepartmentofElectricalandComputerEngineeringUniversityofUtahDuringcharacterizationofshortfiberopticcablesofapproximatelymeter,FresnelreflectionsposeaseriouschallengetoaccuratedamagedetectionTheFresneltailobliteratesanysmallreflectionsthatareproducedbydamagedsectionsofcable,andthedamageisoverlookedSimulationMethodTheFiniteDifferenceTimeDomainmethodwasimplementedinMATLABtosimulateapulseoflighttravelingthroughthepatchandtestfibersThefollowingparametersusedinthesimulationwereobtainedfromanactualOTDRsystem:Indexofrefraction(n)oftestfiber=,Wavelength(λ)oflightpulse=nanometersPulseDurationAbnormalitiesinthefiber,suchasbends,cracks,connectors,andotherabruptchangesintherefractiveindexcreatereflectionspikescalledFresnel(“Fre'nel”)reflectionsAfteraspikeisdetected,asignificantdelayoccurswhenthereflectometer‘settlesdown’fromitssaturatedstateThisdelayiscalledaFresneltail(Figure)Figure:SimulatedFresnelTailskews,thenobliterates,thedamagereflectionatlargerdurationsFigure:CommontypesoffiberopticconnectorswithrelativereflectionmagnitudesshownFigure:OTDRscreenshotshowingreflectionspikefromcableconnector,andresultingFresneltail(areamarkedbybracket)Figure:Simulatedidealresponseshowingfiberdamage(smallreflectionbumps)DamageisvisiblebecausenoFresneltailispresentTodeterminetheeffectofthelightpulsedurationonthesaturationleveloftheOTDRunit,oneperiodofaraisedcosinepulsewastransmittedthroughthefiberatvariousfrequenciesApulsedurationofmicrosecondprovedtobethemostfavorablyresponsivefortheparametersofthesimulation(seeFigure)Inrealworldapplication,however,thedurationmustactuallybesmallerduetotherelativelyslowsimulationspeedvsthephysicalspeedoflightSummaryShortfiberopticcablespresentmanychallengesthatmustbeovercomeinordertoaccuratelydetectfiberdamageusingOTDRPulsedurationsshorterthanmicrosecond,andAngledPhysicalContact(APC)fiberconnectorsarerecommendedtoprovidethegreatestreductioninFresnelreflectionByperformingOTDRsimulations,anopticalsystemsengineercouldunderstandthebehaviorofafibernetworkanddetectpotentialproblemsbeforeactualproduction

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