超短脉冲在色散渐减光纤环型镜中传输特性的研究

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1、华南师范大学硕士学位论文超短脉冲在色散渐减光纤环型镜中传输特性的研究姓名：陈昭喜申请学位级别：硕士专业：光学指导教师：徐文成20050501性。由于受到拉曼自频移的影响，输出脉冲中心发生了漂移，和输入脉冲比较有时间延迟。三阶色散对输出脉冲的时间延迟有影响，负三阶色散相对正三阶色散，更有利于抑制时间延迟。同时具有负三阶色散的光纤环型镜在脉冲的压缩因子、峰值功率及光纤环的透射率等方面都要优于具有正三阶色散的光纤环型镜。对于DDF-NOLM，负三阶色散对脉冲的压缩是更有利的。第五章：工作总结和展望。关键字：非线性光学、非线性光纤光学、非线性光纤环型镜、色散渐减光纤AbstractThestudy

2、offiberlaserisaveryimportantareaforthenonlinearopticalresearch，whichisregardedasoneofthekeytechnologiesforthegenerationofhighqualityultra—shortopticalpulsethatisneededforthemodernlongdistance，ultra-highbitrateopticalcommunicationsystems．Althoughitispossibletoobtainpicosecondorsub-picosecondoptical

3、pulseinadispersiondecreasingfiberbyadiabaticsolitoncompression，theoutputpulseisnotsatisfyingduetothewidepedestalaccompaniedwiththepulse．Thepedestalisharmfulbecauseitcanleadtocrosstalkbetweenpulsesinacommunicationsystem．However，NonlinearOpticalLoopMirror(NOLM)canbeusedtosuppressthatpedestalandcompr

4、esspulsesmoreproperly．Moreover，NOLM，whichcanbeusedasasaturableabsorber，hasmanyimportantapplicationsofpassivemodelocktechnologiesinopticalfiberlasers，especiallyinEr—droppedfiberlasers．Inthisthesis，NOLMconstructedbydispersiondecreasingfiber(DDF-NOLM)isstudied．Thepropagationpropertiesoftheopticalpuls

5、einDDF—NOLMarediscusseddetailedly，includingthepulseevolutioninthefiberloopmirror，thecompressionfactors，thepedestalenergyandthepeakpoweroftheoutputpulse．AnewtypeofNOLMisalsopresentedthatconstructedbyasegmentofconventionalsing!emodefiberandasegmentofdispersiondecreasingfiber．Theopticalswitchingprope

6、rtiesandthepropagationsofopticalpulsesinthisnewNOLMarealsostudiedSomeusefulconclusionsareachieved．Thethesisconsistsof5chapters：Chapter1：ShowsthebasicstructureofNOLM，presentstheapplicationsandtheresearchhistoryoftheNOLM．Chapter2：AnalyzesthemechanismsoftheNOLM，includingthepropagationequationsofoptic

7、alpulseinfibersandthemechanismofopticalcouplerandtheopticalswitch．Chapter3：ProposesthenewtypeofNOLMbasedonthepreviousstudiesandfindsouttheoptimalstructureoftheRewNOLMfromseveralschemes，whichiseonstructedbyasegmen