分类号：UDC：密级：公开编号：成都信息工程学院学位论文光纤零色散附近的自相位调制不稳定性研究论文作者姓名：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：2009年06月01日光纤零色散附近的自相位调制不稳定性研究摘要从光纤中包含高阶色散的扩展非线性薛定谔方程出发，解析并计算研究了只有二阶和只有四阶色散时的调制不稳定性条件和增益谱。讨论了增益谱谱宽和谱峰随相关参数的变化规律。研究表明，在最小群速度色散附近时，四阶色散对光纤的调制不稳定性起决定性作用。当只有二阶色散时，随二阶色散系数的增大，谱宽变窄，谱峰变化不大；随着非线性系数和入纤功率的增大，谱峰变大，谱宽变宽；当只有四阶色散时，随着四阶色散系数的增大，谱宽变窄，谱峰变大;随着非线性系数和入纤功率的增大，谱峰变大，谱宽变宽，这一点与二阶色散的情形一样。而三阶色散对调制不稳定性不起作用。关键字：调制不稳定性；高阶色散；增益谱；自相位调制StudyonSelf-phaseModulationInstabilityintheVicinityofZero-dispersionRegimeofanOpticalFiberAbstractStartingfromtheextendednonlinearSchrödingerequationincludinghigh-orderdispersioninthefiber,theconditionandgainspectrumofmodulationinstabilityarecalculatedandanalyzedincaseofonlythesecond-orderorfourth-orderdispersioneffect.Andthevariationofthespectralwidthandspectralpeakwiththerelativeparametersisalsodiscussed.Theresultsshowthat,thefourth-orderdispersioneffectdominatesmodulationinstabilityinthevicinityofminimumgroup-velocityregime.Whenthereexistsonlythesecond-orderdispersion,withtheincreaseofthedisper-sionparameter,thespectrawidthnarrowswhilethespectralpeakkeepsnearlyunchanged.However,boththespectralwidthandthespectralpeakincreasewiththenonlinearcoefficientandtheinputopticalpower.Whenthereexistsonlythefourth-orderdispersion,withtheincreaseofthedispersionparameter,thespectrawidthnarrowswhilethespectralpeakincreases.However,boththespectralwidthandthespectralpeakincreasewiththenonlinearcoefficientandtheinputopticalpower,whichisthesameasthecaseofsecond-orderdispersion.Thethird-orderdispersiondoesnotinfluencethemodulationinstability.Keywords:modulationinstability;high-orderdispersion;gainspectra;self-phasemodulation目录论文总页数:17页TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc231186517"1引言PAGEREF_Toc231186517\h1HYPERLINK\l"_Toc231186518"2影响光脉冲在光纤中传输的各种因素PAGEREF_Toc231186518\h1HYPERLINK\l"_Toc231186519"2.1光纤的基本特性PAGEREF_Toc231186519\h1HYPERLINK\l"_Toc231186520"2.2光纤损耗PAGEREF_Toc231186520\h2HYPERLINK\l"_Toc231186521"2.3光纤