光电子学第2章_介质波导与光纤

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1、Chapter2DielectricWaveguidesandOpticalFiber2.1SymmetricplanardielectricSlabwaveguide2.2dispersionintheplanarwaveguide2.3Stepindexfiber2.4Numericalaperture2.5Dispersioninsinglemodefibers2.6Dispersion,electrical,andopticalbandwidth2.7Thegradedindexopticalfiber2.8Lightabsorpti

2、onandscattering2.9Attenuationinopticalfibers2.10Fibermanufacture“Theintroductionofopticalfibersystemswillrevolutionizethecommunicationsnetwork.Thelow-transmissionlossandthelargebandwidthcapabilityofthefibersystemsallowsignalstobetransmittedforestablishingcommunicationsconta

3、ctsoverlargedistancewithfewornoprovisionsofintermediateamplification.”—CharlesK.Kao光纤系统的引入将使通信网络产生革命。光纤系统的低传输损耗和巨大的带宽能力允许信号在很少经过或者不经过中间放大的情况下实现超远距离的传输，建立通信联系。——查尔斯高锟TerminologyWaveguide:波导FurtherPhaseChangeofφ：附加相位φ；OpticalPathLength（OPL）：光程；ConstructiveInterference：相长干涉，相干

4、加强；DestructiveInterference：相消干涉，相干减弱；PhaseDifference(PD)：相位差；OpticalPathDifference(OPD):光程差；PolarizationStateofLightWave：光波偏振态StateofPolarization（SOP）:偏振态FieldPattern：场图ResultantWave：合成波；StandingWave：驻波；TerminologyWavevector：波矢SingleModeWaveguide(SMwaveguide):单模波导MultimodeW

5、aveguide(MMwaveguide):多模波导NormalizedThickness:归一化膜厚NormalizedFrequency:归一化化频率V-number:V数Cut-offWavelength:截至波长TransverseElectricfieldmode:横电场模式TransverseMagneticfieldmode:横磁场模式ModeFieldWidth(MFW):模场宽度ModeFieldDiameter(MFW):模场宽度Constantphasewavefront：等相位面Tounderstandthegener

6、alnatureoflightwavepropagationinopticalwaveguides,wefirstconsidertheplanerdielectricslabwaveguideshowninFigure2.1,whichisthesimplestwaveguideintermsoftractableanalysis.Aslabofdielectricofthickness2aandrefractiveindexn1issandwichedbetweentwosemi-infiniteregionsbothofrefracti

7、veindexn2(n2

8、ycanreadilypropagatealongsuchawaveguide,inazigzagfashion,provideditcanundergototal