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1、基于光束传播法的单芯到双芯单模光纤耦合分析//.paper.edu-1-One-coretotwo-coresinglemodefibercouplinganalysisbasedonbeampropagationmethodLiboYuan，ZhihaiLiu，JunYang，ChunyingGuanPhotonicsResearchCenter,CollegeofScience,HarbinEngineeringUniversityHarbin（150001）AbstractAsimplecouplingapproachbetweenaone-coreandatwo-co
2、resinglemodefiberhasbeenproposedanddemonstrated.Bywayofsplicingandtaperingatthefusionpointofone-coresinglemodefiberandthetwo-coresinglemodefiber,aneffectivecouplingtechniqueisimplemented.Thecouplingprocessingissimulatedbythebeampropagationmethod.Theeffectsofthetwocoresofthetwo-corefibernon-
3、symmetryandtherefractiveindexofeachcoreslightlydeferentarealsoinvestigated.Thetheoreticalpredictionisconfirmedbytheexperimentalresultsandthedifferencebetweensimulationandexperimentalresultsisalsodiscussed.Keywords:fiberopticcoupler,two-corefiber,beampropagationmethodOCIScodes:060.1810Couple
4、rs,switches,andmultiplexers;060.2340Fiberopticscomponents1.IntroductionSeveraltypesofmicro-structuredopticalsilicafibershavebeendevelopedinfiberoptics,forinstance,photoniccrystalfiberorhollyfiber[1-3].Inthiswork,however,thetraditionalindex-guidedmulti-corefibersareconcerned.Itisproposedinth
5、efieldsofopticalcommunication[4],components[5-10],andopticalsensorsduetotheircompactandpotentialapplicationssuchaspowerfulcompactfiberlaser[11,12],bendingsensing[13-15],andnonlineardevices[16-18].Multi-coreopticalfiberwithnominallysingle-modecoresprovidesahostfortheinvestigationofmanypotent
6、ialapplications.Amajordisadvantageassociatedwiththeiruse,however,isthedifficultyinbothlightexcitinganddetectingthesignalsinthemulti-coresbecauseoftheirsmallsizeandrelativelycloseproximity.Becauseeachcorehastypicallyaradiusofonlyafewmicrometersandtheirseparationisoftheorderofseveraltimesthec
7、oreradiusinthecladdingwithinthediameterof125m.Itisimpossibletobuttcoupleor splicestandardfibersdirectlytothem.Inordertoovercomethisproblem,LuiandChuhaveproposedacouplingtechnique[19],whichemploysbulkopticalelementsandlensestofocustheinputontothemulti-cor
