光纖中光孤子傳輸?shù)目梢暬抡娣治?br>

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目錄
摘要 1
Abstract 2
第一章 緒 論 4
1.1研究背景 4
1.2 光孤子仿真研究 5
1.3本文內(nèi)容 9
第二章 光孤子及系統(tǒng)的原理分析 11
2.1光孤子 11
2.2 光孤子系統(tǒng) 11
2.2.1 光孤子的產(chǎn)生 11
2.2.2 光孤子特性 12
2.2.3光孤子系統(tǒng)結(jié)構(gòu) 12
2.3光孤子系統(tǒng)理論 13
2.4本章小結(jié) 15
第三章 可視化程序設(shè)計(jì) 16
3.1非線性薛定諤方程 16
3.1.1NLSE方程 16
3.1.2對(duì)稱分布傅立葉 16
3.2 軟件設(shè)計(jì) 16
3.2.1初始化函數(shù)（init） 17
3.2.2 脈沖產(chǎn)生函數(shù)（genepulse） 17
3.2.3 光纖傳播函數(shù)（propagation） 17
3.2.4 主程序的設(shè)計(jì)（main） 17
3.3軟件參數(shù) 18
3.3.1光纖參數(shù) 18
3.3.2輸入場(chǎng) 18
3.3.3繪圖選項(xiàng) 18
3.4軟件界面 19
3.5本章小結(jié) 19
第四章 光孤子可視化分析 20
4.1光纖損耗 20
4.2光纖非線性 20
4.2.1拉曼散射 21
4.2.2自陡峭效應(yīng) 22
4.3二階色散 22
4.4三階色散 23
4.5不同狀態(tài)的孤子 24
4.6本章小結(jié) 26
總 結(jié) 27
致 謝 28
參考文獻(xiàn) 29
附 錄 33


摘要 對(duì)于現(xiàn)代通信技術(shù)，光孤子的發(fā)現(xiàn)是通信技術(shù)的里程碑。光孤子有著很好的穩(wěn)定性，在高溫環(huán)境、長(zhǎng)距離方面有著普通光纖通信不可比擬的優(yōu)勢(shì)，因此對(duì)于光孤子的研究非常有必要。
本文針對(duì)光孤子通信，對(duì)現(xiàn)在光孤子研究領(lǐng)域的文獻(xiàn)進(jìn)行了廣泛的閱讀和參考，并整理分析。結(jié)合目前光孤子研究的成果，對(duì)光孤子傳輸特性進(jìn)行研究和分析：
第一部分：介紹了國(guó)內(nèi)外光孤子研究進(jìn)展和光孤子在傳輸特性方面的仿真研究；
第二部分：解釋了光孤子的概念，同時(shí)對(duì)光孤子的產(chǎn)生進(jìn)行了分析；其次對(duì)光孤子通信系統(tǒng)作了詳細(xì)地介紹，構(gòu)造了光孤子傳輸模型；最后闡述了光孤子通信系統(tǒng)運(yùn)作的原理；
第三部分：進(jìn)行軟件的設(shè)計(jì)。利用Matlab設(shè)計(jì)出能對(duì)光孤子傳輸進(jìn)行可視化仿真的軟件，首先對(duì)通用函數(shù)（初始化函數(shù)init）進(jìn)行編程，隨后運(yùn)用Matlab語(yǔ)言描述分步傅立葉傳輸模式（propagation）和脈沖產(chǎn)生函數(shù)（genepulse），最后是在調(diào)用以上三個(gè)函數(shù)的情況下，設(shè)計(jì)出主函數(shù)（main）；
第四部分：運(yùn)行程序?qū)饫w損耗、非線性效應(yīng)和色散進(jìn)行分析，并對(duì)不同峰值功率的光孤子進(jìn)行仿真，通過(guò)對(duì)仿真圖形的分析，清晰地認(rèn)識(shí)到各個(gè)因素對(duì)光孤子的影響。
⑴損耗影響了光孤子的峰值功率，使得脈沖能量在傳輸過(guò)程中不斷逸散；
⑵非線性是介質(zhì)的非線性極化效應(yīng)，它的作用是使脈沖寬度變窄；
⑶由于色散的作用，脈沖中各個(gè)單色光以不同的速度在介質(zhì)中傳輸，導(dǎo)致脈沖寬度不斷加寬而失真；
⑷峰值功率越高孤子也就越不穩(wěn)定。隨著峰值功率的提升，脈沖呈周期性的增強(qiáng)和減弱；當(dāng)峰值功率再次增加后，脈沖將不再穩(wěn)定，會(huì)逐漸分裂成兩個(gè)脈沖繼續(xù)傳輸；當(dāng)峰值功率足夠高后，脈沖將無(wú)法傳輸，在光纖中很快消散。
關(guān)鍵詞：光孤子、非線性效應(yīng)、色散、傳輸特性、仿真

Visual simulation and analysis of the transmission of optical soliton in optical fiber
Abstract For the modern communication technology, the discovery of optical soliton is communication technology milestone.Optical soliton has good stability, and to compare with the ordinary optical fiber communication,the environment of high temperature and long distance are incomparable advantages, therefore the research of optical soliton is very necessary.
In view of the optical soliton communication，we have a reading and reference, and analysis for now the research literature in the field of optical soliton extensive.To combine the results of optical soliton research,we research and analysis on the optical soliton transmission characteristics.
The first part:Soliton research progress at home and abroad are introduced and optical soliton transmission characteristics in simulation research are In the column;
The second part:We explain the concept of optical soliton,and the generation of optical solitons are analyzed at the same time; Second,optical soliton communication system is introduced in detail, and the structure of optical soliton transmission model is constructed; Finally,we expound the operation principle of optical soliton communication system;
The third part:We have a design of software.Using Matlab to design optical soliton transmission visual simulation software, first of all, we designed the general function programming (init) initialization function, then used the Matlab language to describe fractional Fourier transfer mode (propagation) and pulse function (genepulse), the final is in the case of the above three function called,we designed the main function (main);
The fourth part:To run the program, the nonlinear effect of fiber loss and dispersion is analyzed, and the peak power of the optical solitons are simulated, based on the analysis of the simulation, a clear understanding to the various factors the influence of the optical soliton is presented .
⑴Loss affects the optical soliton peak power, pulse energy in the transmission process is lossing.
⑵The nonlinear polarization of medium makes the narrow pulse width.
⑶Due to the dispersion,each monochromatic light of optical soliton at a different speed transmission in medium, leads to pulse width continuously widened and distortion .
⑷The higher the peak power soliton and the more unstable. Up the peak power, pulse of periodic increase and decrease; After the peak power increase again, pulse will no longer be stable, and at time cont..