【作者】 唐甜甜；

【导师】 蔡祥宝；

【作者基本信息】 南京邮电大学 ， 光学工程， 2011， 硕士

【摘要】 随着通信技术的发展,人们对信息的需求量越来越大,传统的光纤传输系统容量已逐渐不能满足商业应用的要求,建设经济、可靠、大容量的全光通信网络,已成为未来通信网建设的必然趋势。光孤子通信是一种非线性全光长距离通信,它的原理是利用光脉冲在光纤中产生的非线性压缩来补偿脉冲的色散展宽,在此基础之上对光纤损耗进行合理增益,就可把光信号无畸变的传输极远的距离,最终实现高速孤子脉冲的稳定传输。本文利用分布傅里叶法求解了在各种高阶效应影响下的高阶修正非线性薛定谔方程,并以此为模型,利用Matlab仿真的方法,模拟了光脉冲在各种高阶效应影响下的传输演化特性,其中包括自抖效应、内拉曼散射效应及三阶色散共同作用下,单飞秒孤子及双飞秒孤子在光纤内的传输特性;四阶及五阶光孤子在普通光纤和包含五阶非线性光纤这两种不同的环境中传输演化特性的分析和比较;单孤子及多孤子在三阶色散、五阶非线性、啁啾等因素共同作用情况下传输演化特性等等。可以看出非线性效应在一定程度上平衡了负的三阶色散在光孤子传输过程中造成的超前效应的影响。五阶非线性的存在,抑制了高阶孤子脉冲在群速度色散作用下发生的分裂,使得高阶孤子不再呈现周期性的变化,而是被压缩成一个主峰及一对对称的弱旁瓣,此时在传输线路中加入高通滤波器,即可使光脉冲沿着传输方向稳定不变地传输。对于多种高阶微扰影响下的孤子对,五阶非线性则会引发孤子脉冲波形作周期性变化、孤子间能量发生转移、孤子间相互作用增强等后果。利用色散管理可以改善以上情况,它是通过色散的合理搭配,来减小光脉冲宽度的变化,抑制高阶非线性的作用,使得光脉冲稳定传输,不发生偏转,与传统孤子相比,色散管理孤子具有很大的优越性。更多还原

【Abstract】 With the development of communication technology, the demand of information is increasing. The store capacity of traditional optical fiber transmission system gradually can not meet the requirements of business applications. It has become an inevitable trend to build all-optical communications network more economical, more reliable and higher capacity. The technology of optical soliton communication is the nonlinear and long distance all-optical communication. It accomplishes stable transmission by what strong pulse products nonlinear suppression compensating broadening of pulse dispersion in optical fiber. Based on that, if the lost fiber energy get reasonable plus, the light signal can transmit a long distance without distortion. And it will ultimately accomplish the stability of high speed optical pulse transmission.In the thesis, symmetric slit-step Fourier transform method is used in solving high order nonlinear Schr?dinger equation under a variety of high order effect. And the high order nonlinear Schr?dinger equation is also treated as the model to simulate optical pulse propagation under the influence of a variety of high order effect, including single fs optical pulse and double fs optical pulses propagation under the influence of self steeping, self frequency shift and third order dispersion, comparing and analyzing fourth order and fifth order optical pulse propagation in the environment with or without fifth order nonlinear. After considering the influence of third order dispersion, fifth order nonlinear and chirp such cases, the paper also simulates the single soliton and multi-soliton transmission propagation. Nonlinear effects can balance the influence of the lead effect caused by the negative third-order dispersion to some extent .The existence of fifth order nonlinear restrains the split of high order optical pulse under the influence of GVD. It makes high order optical pulse does not split cyclically, but compressed into a main peak and a pair of weak side lobes. Adding a high-pass filter in the transmission line will make the optical pulses along the transmission direction transmit steadily. For the optical soliton pairs which under the influence of a variety of higher order perturbation, fifth-order nonlinear will trig optical soliton pulse change cyclically, the energy is transferred between solitons, soliton interaction will be enhanced, too. However, dispersion management can improve above conditions. If dispersion is allocated reasonably, little changes will happened in the width of the optical pulse and the role of higher order nonlinear can also be suppressed. Based on that, the optical soliton pulse will not deflect in the transmission process. Compared with the traditional soliton, dispersion management has great advantages.更多还原