分类号：O437UDC：密级：公开编号：成都信息工程学院学位论文光纤正色散区相位受扰动的连续光波的波形演化论文作者姓名：申请学位专业：申请学位类别：指导教师姓名（职称）：论文提交日期：光纤正色散区相位受扰动的连续光波的波形演化摘要本文从光纤中光脉冲的非线性薛定谔方程出发，采用分步傅立叶算法，利用matlab大型仿真软件编程，在光纤正色散区，数值模拟了相位发生扰动的连续光波在传输中的波形演化，并与负色散区情形进行了比较，总结了亮光孤子串产生的条件及与调制不稳定性的关系。结果表明：在给定的扰动参数下，随距离的增加，相位受扰动的连续光波在正色散区内并没有像在负色散区那样逐渐演化成等宽、等间距的超短脉冲串，而是形成振荡现象，并伴随有暗孤子串的产生和退化，说明在正色散区不能产生亮孤子但可产生暗孤子。关键词：色散效应；非线性效应；调制不稳定性；相位扰动；脉冲振荡；WaveformEvolutionofPhasePerturbedContinuousOpticalWaveintheNormalDispersionRegionofFibersAbstractStartingfromthenonlinearSchrödingerequationofopticalpulsespropagatinginopticalfibers,usingthesplit-stepFouriermethodandlarge-scalesimulationsoftwareofMatlab,waveformevolutionofphaseperturbedcontinuousopticalwaveinthenormaldispersionregionoffibersisnumericallysimulated.Moreover,comparisonismadewiththecaseintheanomalousregion.Andtheconditionofgeneratingbrightopticalsolitontrainsanditsrelationtomodulationinstabilityeffectaresummarized.Theresultsshowthat,forthegivenperturbationparameters,withtheincreaseofthedistance,insteadofgraduallyevolvingintoultra-shortpulsetrainswithequalspacingandwidthjustlikeintheanomalousdispersionregion,phaseperturbedcontinuousopticwavetakesonoscillatingfeatureandaccompaniedbygenerationanddegenerationofthedarksolitontrains.Thisworkindicatesthat,inthenormaldispersionregion,thebrightsolitoncannotoccurwhilethedarksolitonstakeopposite.Keywords:dispersioneffect;nonlineareffect;modulationinstability;phaseperturbation;pulseoscillation目录论文总页数：16页TOC\o"1-2"\h\z\uHYPERLINK\l"_Toc231139697"1引言PAGEREF_Toc231139697\h1HYPERLINK\l"_Toc231139698"2影响光脉冲在光纤中传输的各种因素PAGEREF_Toc231139698\h1HYPERLINK\l"_Toc231139699"2.1光纤的基本特性PAGEREF_Toc231139699\h1HYPERLINK\l"_Toc231139700"2.2光纤损耗PAGEREF_Toc231139700\h2HYPERLINK\l"_Toc231139701"2.3光纤色散PAGEREF_Toc231139701\h2HYPERLINK\l"_Toc231139702"2.4光纤的非线性特性PAGEREF_Toc231139702\h3HYPERLINK\l"_Toc231139703"3脉冲在光纤中的传输的理论基础PAGEREF_Toc231139703\h5HYPERLINK\l"_Toc231