题 目： 光孤子传输特性的分析 学 院： 信息学院 专 业： 通信工程 姓 名： XXX 指导教师： 时书丽 完成日期： XXXX/X/XX
摘 要
现实世界中的光孤子是在光纤中经过长距离的传播以后，脉冲宽度仍然保持不变的光脉冲。光孤子是在光纤中的非线性效应与群速度色散共同作用时处于平衡态时产生的。光孤子通信是使用光孤子作为载体的一种通信方式，光孤子通信技术是一种全新光纤通信技术，其具有高速、容量大、传输距离远等特征。光孤子通信技术基于非线性光学的理论基础,通过降低或克服光纤中的色散效应以降低在传输过程中对光信号限制，可传输信号至数万公里以外。然而现实中的光纤通信技术却不是这么理想的，这种通信技术受到多方面的影响，导致其传输特性和传输容量达不到预期值。影响光孤子通信的因素主要有两方面：一是光纤介质，如损耗、色散等；二是非线性效应，如自相位调制(SPM)等。本文在研究光孤子传输特性中主要做了以下几个方面的工作：
1、本论文首先介绍了光孤子的概念，并对其产生机理进行了分析，讨论了其传输的线性特性和非线性特性；建立了孤子包络传输方程；
2、本文采用了分步傅里叶变换和逆散射法两种方法对孤子传输方程进行了求解并进行了比较分析；
3、列举了影响孤子传输的因素并逐一对其进行了分析并提出了改进方法。
关键词：光孤子；传输特性；光孤子通信系统
I
Abstract
In the real world is optical solitons in optical fiber after long distance transmission, optical pulse pulse width stays the same. Nonlinear effect of optical solitons in optical fiber and group velocity dispersion interaction in the equilibrium state. Optical soliton communication is to use a kind of optical soliton as carrier communication, optical soliton communication technology is a new optical fiber communication technology, it has the characteristics such as high speed, large capacity, long transmission distance. Optical soliton communication technology based on the theory of nonlinear optics, by reducing or overcoming the dispersion effect in the optical fiber to reduce during transmission limit, optical signals can transmit signal to tens of thousands of kilometers away. Optical fiber communication technology in the reality, however, is not so ideal, this kind of communication technology under the influence of various, its transmission characteristics and transmission capacity can not meet the expected value. The influencing factors of optical soliton communication mainly has two aspects: one is optical fiber media, such as loss, dispersion, etc.; Second, nonlinear effects, such as the self-phase modulation (SPM). Based on the study of optical soliton transmission characteristics mainly done the following several aspects：
1. this paper first introduces the concept of optical soliton, and its mechanism are analyzed, and discussed the linear and nonlinear characteristics of transmission; The equations of soliton envelope transmission;
2. In this paper, by using the fractional Fourier transform and inverse scattering method of soliton transmission equation of the two methods to solve and compare the analysis;
3. Lists the influence factors of soliton transmission and one by one for analysis and improvement methods are put forward.
Key words: optical soliton; transmission characteristics; the optical soliton
communication system
II
目 录
摘 要 ............................................................................................................ I 序 言 ........................................................................................................... 1 一、光孤子概述 ............................................................................................ 2
1. 光孤子 .......................................................................................................................... 2 2. 光孤子的产生机理 ...................................................................................................... 2
2.1 光纤中的线性特性 ............................................................................................................. 2 2.2 光纤的非线性特性 ............................................................................................................. 4
3. 光纤中光波的包络方程 .............................................................................................. 5 4. 光孤子传输系统的技术参数 ...................................................................................... 7
4.1 色散长度LD ....................................................................................................................... 7 4.2 孤子周期Z .......................................................................................................................... 7 4.3 归一化损耗? ..................................................................................................................... 7
二、非线性薛定谔方程的解 ........................................................................ 7
1. 分步傅里叶变换法求解 .............................................................................................. 7 2.逆散射方法（IST）求解 ................................................................................................ 9
2.2.1 逆散射方法的基本思路 .................................................................................................. 9 2.2.2逆反射变换方法的关键 ................................................................................................. 11
3.分析讨论 ...................................................................................................................... 12
三、影响光孤子传输性能的因素 .............................................................. 12
1. 孤子间的相互作用 .................................................................................................... 12
3.1.1孤子间相互作用分析 ..................................................................................................... 12 3.1.2孤子相互作用的抑制 ..................................................................................................... 15
2. 初始啁啾 .................................................................................................................... 17 3. 高阶非线性效应与高阶色散 .................................................................................... 19 4.本章小结 ...................................................................................................................... 21
四、总结 ..................................................................................................... 21
1. 结论与启示 ................................................................................................................ 21 2. 建议 ............................................................................................................................ 22
参考文献 ..................................................................................................... 23 致 谢 ......................................................................................................... 24
光弧子论文 - 图文
