本文選題：高非線性光纖　切入點(diǎn)：受激布里淵散射　出處：《蘭州理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在光通信技術(shù)高速發(fā)展,對(duì)信息的轉(zhuǎn)換和接收能力需求進(jìn)一步提升的時(shí)代背景下,全光網(wǎng)絡(luò)通信勢(shì)必取代現(xiàn)有的網(wǎng)絡(luò)通信系統(tǒng)。全光網(wǎng)絡(luò)通信技術(shù)采用光-光直接轉(zhuǎn)換,具有更高效的轉(zhuǎn)換效率、更大的傳輸容量(大約幾十Tb/s),其潛在的應(yīng)用價(jià)值備受人們期待。快慢光技術(shù)具有調(diào)控光速的能力,可以被用來解決全光通信網(wǎng)絡(luò)中面臨的對(duì)信號(hào)光的同步和緩存的難題,實(shí)現(xiàn)光交換和光路由,解決全光網(wǎng)絡(luò)通信過程中面臨的關(guān)鍵性難題。對(duì)于不同的快慢光系統(tǒng),光纖中快慢光技術(shù)是近年來的研究熱點(diǎn)。而光纖中基于受激布里淵散射(SBS,Stimulated Brillouin scatting)效應(yīng)實(shí)現(xiàn)快慢光具有極低的泵浦光閾值功率、可以室溫下操作、工作波長(zhǎng)可調(diào)以及與光纖通信系統(tǒng)兼容性良好等優(yōu)點(diǎn),更是光速可調(diào)技術(shù)中的研究熱點(diǎn)。本論文以布里淵散射產(chǎn)生快光為研究對(duì)象,圍繞提高時(shí)間提前量、減少脈沖失真分別對(duì)光纖中窄帶寬泵浦光和寬帶寬泵浦光SBS快光特性進(jìn)行了討論研究,主要內(nèi)容如下:1.介紹對(duì)比了實(shí)現(xiàn)快慢光的各種調(diào)控技術(shù),主要論述了近年來國(guó)內(nèi)外基于受激布里淵散射增加快光提前、減小脈沖失真、使用特種光纖提高提前效率的研究現(xiàn)狀和應(yīng)用前景。2.給出了光纖中布里淵散射過程的物理模型和數(shù)學(xué)推倒過程;考慮到光纖中產(chǎn)生快慢光條件的不同,完善了受激布里淵散射聲波-光波耦合方程組;以單色泵浦光為例,從受激布里淵散射耦合方程出發(fā),研究了SBS快光的小信號(hào)模型解析解,分別得出了快光的時(shí)間提前量和脈沖壓縮因子。3.基于受激布里淵散射三波耦合方程組,應(yīng)用小信號(hào)分析,研究了高非線性光纖的信號(hào)光脈沖提前及形變。結(jié)果表明光纖中信號(hào)光脈沖時(shí)間提前量在一定范圍內(nèi)隨著輸入信號(hào)光功率和傳輸距離的增長(zhǎng)而近似線性增長(zhǎng),同時(shí)脈沖壓縮程度加強(qiáng);相同條件下非線性光纖比普通單模光纖的時(shí)間提前量更大,在50m長(zhǎng)高非線性光纖中信號(hào)光能量在50mw時(shí)實(shí)現(xiàn)了203ns的時(shí)間提前量和較小的脈沖形變。高非線性光纖的快光提前效率顯著提高,脈沖形變顯著減小,研究結(jié)果對(duì)快光的實(shí)現(xiàn)和應(yīng)用具有參考意義。4.提出使用具有多條譜線結(jié)構(gòu)的泵浦光實(shí)現(xiàn)布里淵寬帶快光的方法,分析了多條譜線對(duì)應(yīng)的寬帶泵浦下的布里淵吸收特性和相應(yīng)的相位變化情況,得出通過等振幅譜線疊加可以得到寬帶吸收譜,吸收譜寬度隨著譜線數(shù)目的增加而增加,并且譜線間距對(duì)吸收譜底部線性度影響嚴(yán)重。還介紹了寬帶寬SBS理論,分別討論了高斯譜寬帶泵浦光和矩形譜平頂泵浦光的布里淵光提前特性,結(jié)果表明高斯譜寬帶泵浦光和矩形譜平頂泵浦光實(shí)現(xiàn)快光可以減小脈沖畸變,較大程度保持原脈沖波形傳輸。同時(shí),相同情況下矩形譜平頂泵浦光在實(shí)現(xiàn)快光過程中脈沖畸變程度更小,相比于高斯譜泵浦光更具優(yōu)勢(shì)。
[Abstract]:With the rapid development of optical communication technology and the further improvement of information conversion and reception ability, all-optical network communication is bound to replace the existing network communication system. With more efficient conversion efficiency, larger transmission capacity (about tens of TB / s), its potential applications are highly anticipated. Fast and slow light technology has the ability to regulate the speed of light, It can be used to solve the problem of synchronization and buffer of signal light in all-optical communication network, to realize optical switching and optical routing, and to solve the key problem in the process of all-optical network communication. In recent years, the technique of fast and slow light in optical fiber is a hot topic, and the fast and slow light based on stimulated Brillouin scattering (SBS) and stimulated Brillouin scattering (SBS) effect has very low threshold power of pump light, which can be operated at room temperature. The advantages of adjustable working wavelength and good compatibility with optical fiber communication system are the research hotspot in the technology of adjusting the speed of light. In this paper, Brillouin scattering (Brillouin scattering) generation of fast light is taken as the research object, and the time advance is improved. To reduce pulse distortion, the characteristics of narrow bandwidth pump light and wide band wide pump SBS in optical fiber are discussed and studied respectively. The main contents are as follows: 1. The various control techniques for realizing fast and slow light are introduced and compared. Based on stimulated Brillouin scattering, this paper mainly discusses how to increase fast light advance and reduce pulse distortion in recent years. The present situation and application prospect of using special optical fiber to improve the advance efficiency. 2. The physical model of Brillouin scattering process in optical fiber and the mathematical push-down process are given, considering the different conditions of producing fast and slow light in optical fiber, The coupling equations of stimulated Brillouin scattering acoustic wave and light wave are improved, and the analytical solution of the small signal model of SBS fast light is studied based on the stimulated Brillouin scattering coupling equation, taking the monochromatic pump light as an example. The time advance and pulse compression factor of fast light are obtained respectively. Based on the coupled equations of stimulated Brillouin scattering, small signal analysis is used. The signal optical pulse advance and deformation of high nonlinear fiber are studied. The results show that the signal optical pulse time advance increases approximately linearly with the increase of input signal optical power and transmission distance in a certain range. At the same time, the pulse compression degree is strengthened, and the time advance of nonlinear fiber is larger than that of ordinary single-mode fiber under the same condition. When the signal light energy is 50 MW, the time advance of 203ns and the smaller pulse deformation are realized in the 50m high nonlinear fiber. The fast optical advance efficiency of the high nonlinear fiber is improved significantly, and the pulse deformation is significantly reduced. The results are of reference significance for the realization and application of fast light. 4. A method of realizing Brillouin broadband fast light using pump light with multiple spectral lines is proposed. The Brillouin absorption characteristics and the corresponding phase changes of Brillouin pumped by broadband pump corresponding to multiple spectral lines are analyzed. It is concluded that the broadband absorption spectrum can be obtained by the superposition of the equal-amplitude spectral lines, and the absorption spectrum width increases with the increase of the number of spectral lines. Moreover, the line spacing has a serious effect on the linearity at the bottom of the absorption spectrum. The theory of wide band SBS is also introduced, and the Brillouin advance characteristics of the broad band pump light of Gao Si spectrum and the flat-top pump light of rectangular spectrum are discussed, respectively. The results show that the fast light can reduce the distortion of the pulse and maintain the transmission of the original pulse waveforms to a large extent by using the broad band pump light of Gao Si spectrum and the flat-top pump light of rectangular spectrum. Under the same condition, the pulse distortion of rectangular flat-top pump is smaller than that of Gao Si.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN253;TN929.1

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