光通信系统之器件new

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1、OpticalFibreCommunicationSystemsLecture5-Devices&ComponentsProfessorZGhassemlooyElectronics&ItDivisionSchoolofEngineeringSheffieldHallamUniversityU.K.www.shu.ac.uk/ocrProf.ZGhassemlooy1Contents§Connectors+OpticalSplice§Attenuators§Coupler§Splitter§Switches§Isola

2、tor§OpticalCrossConnect§Filters§Circulators§Multiplexer&Demultiplexer§AmplifiersProf.ZGhassemlooy2ConnectorsAmechanicaloropticaldevicethatprovidesademountableconnectionbetweentwofibersorafiberandasourceordetector.Prof.ZGhassemlooy3Connectors-contd.Type:SC,FC,ST,

3、MU,SMAiFavoredwithsingle-modefibreiMultimodefibre(50/125um)and(62.5/125um)iLoss0.15-0.3dBiReturnloss55dB(SMF),25dB(MMF)SinglefibreconnectorProf.ZGhassemlooy4Connectors-contd.iSingle-modefiberiMulti-modefiber(50/125)iMulti-modefiber(62.5/125)iLowinsertionloss&ref

4、lectionMT-RJPatchCordMT-RJFan-outCordProf.ZGhassemlooy5OpticalSplicesiMechanical–Endsoftwopiecesoffiberarecleanedandstripped,thencarefullybuttedtogetherandalignedusingamechanicalassembly.Agelisusedatthepointofcontacttoreducelightreflectionandkeepthesplicelossata

5、minimum.Theendsofthefiberareheldtogetherbyfrictionorcompression,andthespliceassemblyfeaturesalockingmechanismsothatthefibersremainedaligned.iFusion–Involvesactuallymelting(fusing)togethertheendsoftwopiecesoffiber.Theresultisacontinuousfiberwithoutabreak.Botharec

6、apableofsplicelossesintherangeof0.15dB(3%)to0.1dB(2%).Prof.ZGhassemlooy6AttenuatorsSinglemodeVariableAttenuator–Repeatable,variableattenuationfrom2to40dB–<-70dBreflectance(unconnectorized)–Polarizationinsensitive–Lowmodalnoise–Long-termreliabilityProf.ZGhassemlo

7、oy7Attenuators-contd.DualwindowInlineattenuatoriBandpass1310/1550nmiFC,SC,ST,andD4stylesiWavelengthindependentiPolarizationinsensitiveiLowmodalnoiseProf.ZGhassemlooy8OpticalCouplersiOpticcouplerseithersplitopticalsignalsintomultiplepathsorcombinemultiplesignalso

8、nonepath.iThenumberofinput(N)/output(M)ports,(i.e.sNxMsize)characterizesacoupler.iFusedcouplerscanbemadeinanyconfiguration,buttheycommonlyusemultiplesoftwo(2x2,4x4,8x