五阶非线性光纤中高斯脉冲的相移和啁啾分析毕业论文.doc

第页分类号：TN929.11UDC：密级：公开编号：成都信息工程学院学位论文五阶非线性光纤中高斯脉冲的相移和啁啾分析论文作者姓名：申请学位专业：电子科学与技术申请学位类别：工学学士指导教师姓名（职称）：论文提交日期：五阶非线性光纤中高斯脉冲的相移和啁啾分析摘要为了探讨光纤的五阶非线性对光脉冲传输的影响，利用同时考虑三阶和五阶非线性效应的非线性薛定谔方程，在忽略光纤色散的情况下，解析推导了高斯光脉冲的非线性相移和频率啁啾。并计算讨论了非线性相移和频率啁啾随五阶非线性系数和光功率的变化。结果表明，与只有三阶非线性的情形相比，正五阶非线性的存在使光脉冲的非线性相移和频率啁啾增大，且正五阶非线性系数越大，非线性相移和频率啁啾越大。而较小的负五阶非线性则使非线性相移和频率啁啾减小，较大的负五阶非线性系数则可能使非线性相移和频率啁啾反号。其它参数相同时，脉冲峰值功率越大，则非线性相移和频率啁啾也越大。关键词：五阶非线性；高斯脉冲；非线性相移；频率啁啾AnalysisonphaseshiftsandfrequencychirpsofGaussianopticalpulsesintheopticalfiberswithquinticnonlinearityAbstractTheaimofthepaperistostudytheeffectofthequinticnonlinearityofanopticalfiberonthepropagationofopticalpulses.Utilizingthecubic-quinticnonlinearSchrödingerequationinwhichthedispersionofopticalfibersisneglected,thenonlinearphaseshiftsandfrequencychirpsofGaussianopticalpulsesareanalyticallyderived.Andtheirvariationwiththequinticnonlinearcoefficientandpeakpowerisalsocalculatedanddiscussed.Theresultsshowthat,incomparisonwiththecaseofcubicnonlinearity,thepositivequinticnonlinearitymakesthenonlinearphaseshiftsandthefrequencychirpsofopticalpulsesincrease.Andthelargerthepositivequinticnonlinearity,thelargerthephaseshiftsandthefrequencychirps.Thesmallnegativequinticnonlinearitymakesthephaseshiftsandthefrequencychirpsdecreasewhilethelargenegativequinticnonlinearitychangesthesignsofthephaseshiftsandthefrequencychirps.Whentheotherparametersarethesame,boththephaseshiftsandchirpsincreasewiththepeakpowers.Keywords:Quinticnonlinearity;Gaussianpulse;nonlinearphaseshifts;frequencychirps第页目录论文总页数：16页TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc231554286"1引言PAGEREF_Toc231554286\h1HYPERLINK\l"_Toc231554287"2影响光脉冲在光纤中传输的各种因素PAGEREF_Toc231554287\h2HYPERLINK\l"_Toc231554288"2.1光纤的基本特性PAGEREF_Toc231554288\h2HYPERLINK\l"_Toc231554289"2.2光纤损耗PAGEREF_Toc231554289\h2HYPERLINK\l"_Toc231554290"2.3光纤色散PAGEREF_Toc231554290\h2HYPERLINK\l"_Toc231554291"2.4光纤的非线性特性PAGEREF_Toc231554291\h3HYPERLINK\l"_Toc231554292"2.4.1三阶非线性效应PA