http://txxy.qqhru.edu.cn/教学参考书ReferenceOpticalFiberCommunicationsExamplePlatform(JH5002）OptiSystem6Fiber-opticcommunicationFiber-opticcommunication1.1ElectromagneticSpectrum1880–AlexanderGrahamBell1930–Patentsontubing1950–Patentfortwo-layerglasswave-guide1960–Laserfirstusedaslightsource1965–Highlossoflightdiscovered1970s–Refiningofmanufacturingprocess（光纤通信元年，1970年美国康宁公司首先制造20dB/km的光纤）1980s–OFtechnologybecomesbackboneoflongdistancetelephonenetworksinNA.DevelopmentMilestones四大里程碑1960年，世界上第一台相干振荡光源－红宝石激光器问世。1970年，美国康宁玻璃公司的卡普隆（Kapron）博士等拉制出损耗仅为20dB/km的光纤1985年，南安普敦大学的Mears等人制成了掺铒光纤放大器（erbium-dopedfiberamplifier,EDFA）90年代，光纤光栅、全光纤光子器件、平面波导器件及其集成的出现Thistinyelectronicallytiltablemirrorisabuildingblockindevicessuchasall-opticalcross-connectsandnewtypesofcomputerdataprojectors.1.3MajorelementsofanopticalfiberlinkOPTICALFIBERAdvantagesofOpticalFibreAdvantagesoffiberopticsAdvantagesoffiberopticsFiberOpticAdvantagesDisAdvantagesoffiberopticsFiberOpticDisadvantagesThreeWindowsTelecommunicationsLocalAreaNetworksCableTVCCTVOpticalFiberSensorsFiberOpticCableFiberOpticCableOpticalfiberconsistsofacore,cladding,andaprotectiveoutercoating,whichguideslightalongthecorebytotalinternalreflection.PreformPreparationChemicalVaporDeposition(O2andSiCl4)SMF(dopant:GeCl4)ChangecompositiontovaryrefractiveindexFiberDrawingHeating(around1600°C)Drawing(dmonitorT°C&Vm/s)Coating(Polymer)VolumeConservesOPTICALFIBERFiberOpticLayersFiberOpticCablePhotons(light“particles”)lightrepresentedbytinybundlesofenergy(orquanta),followingstraightlinepathsalongtherays.PHYSICSOFLIGHTINDEXOFREFRACTIONTotalInternalReflectionSnell’sLawSnell’sLawSnell’sLawTotalInternalReflectioninFiberTwomaincategoriesofopticalfiberusedinfiberopticcommunicationsaremulti-modeopticalfiberandsingle-modeopticalfiber.Advantages:Allowstheuseofnon-coherentopticallightsource,e.g.LED'sFacilitatesconnectingtogethersimilarfibresImposeslowertolerancerequirementsonfibreconnectors.CosteffectiveFiberOpticTypesFiber-Optic