本文選題：光纖 + 受激布里淵散射��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：本文利用了全矢量有限元法和后向差分法,分析了光纖中受激布里淵散射聲波特性,以及聲波與光波間的相互作用,并利用該特性討論了其在傳感及模間色散補(bǔ)償上的應(yīng)用。本文的主要研究內(nèi)容及取得的成果如下:1、為解決布里淵頻移同時(shí)受溫度和應(yīng)變影響的交叉敏感問題,提出了用聲波導(dǎo)布里淵散射同時(shí)檢測(cè)溫度和應(yīng)變的傳感器設(shè)計(jì)方案。根據(jù)聲波導(dǎo)布里淵散射中不同聲模對(duì)溫度和應(yīng)變的敏感度不同,設(shè)計(jì)特定的泵浦光和斯托克斯光頻率,使檢測(cè)的頻譜圖上呈現(xiàn)多峰放大現(xiàn)象。再根據(jù)溫度和應(yīng)變對(duì)聲模特征頻率的影響,區(qū)分出光纖所受溫度和應(yīng)變值。模擬結(jié)果表明標(biāo)準(zhǔn)SMF-28光纖中,R02模對(duì)應(yīng)的溫度敏感度比TR25模對(duì)應(yīng)的溫度敏感度低0.86%,R02模對(duì)應(yīng)的應(yīng)變敏感度比TR25模對(duì)應(yīng)的應(yīng)變敏感度高54.1%。由于R02模和TR25模對(duì)應(yīng)溫度敏感度近似相同,而兩者對(duì)應(yīng)應(yīng)變敏感度相差較大,可以有效地區(qū)分出溫度和應(yīng)變對(duì)布里淵頻移的影響,從而達(dá)到溫度應(yīng)變同時(shí)測(cè)量的目的。2、利用非迭代后向差分法研究了小信號(hào)模型下,少模光纖中受激布里淵散射特性。分析了少模光纖在模分復(fù)用MIMO系統(tǒng)中模間色散的產(chǎn)生原因、受激布里淵散射的慢光效應(yīng),討論了利用受激布里淵散射慢光效應(yīng)進(jìn)行模間色散補(bǔ)償?shù)目尚行�。分析結(jié)果表明當(dāng)少模光纖中LP11模充當(dāng)斯托克斯光時(shí),慢光效應(yīng)可以對(duì)模間色散完全補(bǔ)償;對(duì)于因傳輸信號(hào)變化、外界干擾、光纖不規(guī)則等因素引起的不同模間色散值,可在系統(tǒng)結(jié)構(gòu)不變情況下,僅改變輸入泵浦參數(shù)使得模間色散匹配補(bǔ)償。這種設(shè)計(jì)方案靈活度高、適用范圍廣、具有一定的實(shí)用價(jià)值。
[Abstract]:In this paper, the characteristics of stimulated Brillouin scattering sound wave in optical fiber and the interaction between sound wave and optical wave are analyzed by means of full vector finite element method and backward difference method, and their applications in sensing and dispersion compensation between modes are discussed. The main contents and achievements of this paper are as follows: 1. In order to solve the cross-sensitivity problem of Brillouin frequency shift affected by temperature and strain simultaneously, a sensor design scheme for simultaneous detection of temperature and strain by Brillouin scattering by acoustic waveguide is proposed. According to the sensitivity of different acoustic modes to temperature and strain in Brillouin scattering of acoustic waveguides, specific pump and Stokes light frequencies are designed to amplify the detected spectrum. According to the influence of temperature and strain on the characteristic frequency of acoustic model, the temperature and strain value of fiber are distinguished. The simulation results show that the temperature sensitivity of R02 mode in standard SMF-28 fiber is lower than that of TR25 mode. The strain sensitivity of R02 mode is 54.1 higher than that of TR25 mode. Because the temperature sensitivity of R02 mode and TR25 mode is approximately the same, and the strain sensitivity of R02 mode and TR25 mode is quite different, the effect of temperature and strain on Brillouin frequency shift can be effectively distinguished. In order to achieve the purpose of simultaneous measurement of temperature and strain, the characteristics of stimulated Brillouin scattering in small-mode optical fiber under small signal model are studied by non-iterative backward difference method. The causes of inter-mode dispersion and the slow light effect of stimulated Brillouin scattering in MIMO systems are analyzed. The feasibility of compensation for inter-mode dispersion by using the slow light effect of stimulated Brillouin scattering is discussed. The results show that when LP11 mode acts as Stokes light, the dispersion between modes can be compensated completely by the slow light effect, and the dispersion values of different modes caused by the variation of transmission signal, external interference and irregularity of optical fiber, etc., can be compensated completely by the slow light effect, when the LP11 mode acts as the Stokes light in the optical fiber. When the system structure is invariant, only the input pump parameters can be changed to compensate the dispersion matching between the two modes. This design has high flexibility, wide range of application, and has certain practical value.
【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;TP212

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