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1、暨南大学硕士学位论文ABSTRACTMicrofiberisakindofopticalfiberwhichisfabricatedbyflame/laser-heatedtaperdrawingmethodfromstandardsinglemodefiber.Itpossessesapparentadvantagesinopticalandmechanicalapplicationsovertraditionalopticalfibers,includingtightlightconfinement,intrinsicevanes
2、centfieldandcompactness.Photonicdeviceswithcompactsizescanbeimplementedbybending,twisting,coilingandassemblingmicrofibersinfreespace.Furthermore,byconnectingthemicrofiberdevices,wecouldpotentiallypromotethefurtherdevelopmentofintegratedmicrophotonicplatformswithcomplexo
3、pticalstructures.Hence,animportantproblemneededtobesolvedislow-losssplicingbetweenmicrofibersandefficientassemblingofmicrofiberdevices,sincethepresentmethodshavedifferentlimitationssuchashighsplicing-loss,complicatedoperationsandlowmechanicalstrength.Inthisthesis,weprop
4、osealow-losssplicingmethodwithhighmechanicalstrengthbasedonhigh-substitutedhydroxypropylcellulose（H-HPC）,whichispolymermaterialwithalowrefractiveindex,andwealsoapplyittomanufacturedifferentmicrofiberdevices.Themaincontentofthethesisisasfollows:Inthefirstpart,theevanesce
5、ntcouplingsbetweenparallelmicrofibersareanalyzedwithweakandstrongwaveguideapproximations,respectively.TheH-HPCfilmcoatedonthesurfaceofmicrofibersredistributesthemodefieldspropagatingalongthefiberwhenmaintainingtheindexguidance,whichmeanstheevanescentfieldsbetweentwopara
6、llelmicrofibershavebeenenhancedtoincreasethecouplingefficiencytoimprovethecouplingstrength.Thispartofworkprovidesthetheoryoflow-losssplicingmicrofibersandassemblingthemicrofiberdevices.Inthesecondpart,weproposealow-losssplicingmethodbaseonhigh-substitutedhydroxypropylce
7、llulose(H-HPC).Bydelicatelychoosingthematerialandoptimizingtherelevantparameters,wedesignacompletetechniqueprocess.Theminimalaveragelossis~0.26dBandthejointsegmentcanstandanaxialstressupto~1N.（III）万方数据暨南大学硕士学位论文Inthethirdpart,theH-HPC-coatingsplicingmethodisemployedtoas
8、semblemicrofiberdevicesincludingcoilresonator,Sagnacinterferometer,F-PresonatorandMach-Zehnderinterferometer.A
