近橢圓內(nèi)包層偏振保持光子晶體光纖特性研究.pdf

1、北京交通大學(xué)碩士學(xué)位論文近橢圓內(nèi)包層偏振保持光子晶體光纖特性研究姓名：李一凡申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：延鳳平20071201IE基鑾遵太拳亟堂焦i盆塞△曼S至B△￡!ABSTRACTABSTRACT：Photoniccrystalfibers口CFs)consistingofacentraldefectregionsurroundedbymultipleairbolesrunningalongitslengthha

2、vebeenthesubjectofmuchinterestinrecentyearsbecauseoftheiruniquepropertieswhicharenotrealizedinconventionalopticalfibersUsingPCFs，highlybirefringentfibers，evensinglemodesinglepolarizationfibers，canbeeasilyrealized，bccause

3、theindexcontrastishigherthanconventionalfibersandthefabricationprocesspermitstheformationoftherequiredasymmetricmicrostruetureseal“thefibercoreSofarvarioushighlybirefringentPCFshavebeenpresentedIthasbeenshownthattlleirbi

4、refringenceisoftheorderof104，whichisatleastoneorderofmagnitudelargerthanthatofconventionalfibersThesehighlybirefringentPCFshavegreatapplicationpotentialinthefieldofopticalconkrnunicationegpolarizationsensitiveopticalmodu

5、latorsandinthefieldoffibersensingegfibergyrosHoweverthebirefringenceanddispersionpropertiesofthoseactualPCFsaredifferentfromtheidealizedonesbecauseoftheunpredictableperturbationsofthemicrostructureswhichareinducedbythepr

6、acticalfabricationprocessInthisdissertationthepropertiesofthepolarizationmaintainingPCFsareinvestigatedde印lysuchasmodalbirefringencedispersionandpolarizationstabilityThemainachievementsofthisdissertationaresummarizedintw

7、oparts：1FourkindsofreportedpolarizationmaintaiulngPCFsareanalyzedbyusingafull—vectorfiniteelementmethod，ofwhichthemodalbirefringencecurvesanddispersioncurvesareprovidedFromthenumericalresults，itisennfumedthatthehighlymod

8、albirefringenceisrealizedasthereportedmicrostructurespromisedFurthermore，theanalysesofthepolarizationstabilitiesofthosePCFsareproposedinthisdissertation，whichismeaningfulforthedesigningandfabricatingofthepolarizationmain

9、tainingPCFswitllhigherellortolerance2Anewpolarization—stablehi曲lybirefringentphotoniccrystalfiberdesignedforfibergyrosisproposedByvaryingthediametersoftheairholesnearthefibercoregraduallyanewinnercladdingstructurewithnea