本文選題：光纖錐 + 倏逝波特性�。� 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：光纖錐作為多種光子器件的關(guān)鍵組成部分,其倏逝波傳輸特性和結(jié)構(gòu)特性都對(duì)這些現(xiàn)代光學(xué)器件的工作性能起到?jīng)Q定性作用。論文中基于對(duì)光纖錐光場(chǎng)傳輸和分布特性深入細(xì)致的分析,并結(jié)合非絕熱型光纖錐較強(qiáng)的模式耦合作用和極大的倏逝波強(qiáng)度,將光纖錐應(yīng)用于微位移傳感,獲得了較高靈敏度的傳感效果,具有非常重要的研究意義和較高的市場(chǎng)價(jià)值。主要的研究成果如下。1.結(jié)合光纖模式理論對(duì)比分析了絕熱型光纖錐和非絕熱型光纖錐的傳輸特性,并對(duì)非絕熱型光纖錐的典型結(jié)構(gòu)和制作方法進(jìn)行了介紹。2.對(duì)光纖錐的模式截止條件以及單模工作范圍進(jìn)行了理論分析,并運(yùn)用光束傳播法基于錐腰直徑和錐角兩個(gè)光纖錐的重要結(jié)構(gòu)參數(shù)分別對(duì)單模曲面光纖錐和多模直線型光纖錐的工作特性展開了研究,研究?jī)?nèi)容包括光纖錐輸出端面處的光場(chǎng)分布及模式功率的變化等。研究結(jié)果表明:具有較小錐腰直徑的單模曲面光纖錐出射的波束發(fā)散角最大,模式耦合效率最高,輸出波束的有效模場(chǎng)面積最大,為后續(xù)對(duì)基于光纖錐的微位移傳感應(yīng)用的設(shè)計(jì)與特性分析奠定了基礎(chǔ)。3.基于非絕熱型光纖錐提出了兩種新型的橫向微位移傳感結(jié)構(gòu),分別是雙錐結(jié)構(gòu)(由兩個(gè)光纖錐相對(duì)組成)和單錐結(jié)構(gòu)(由光纖錐和單模光纖組成)。通過對(duì)不同錐腰直徑下兩種結(jié)構(gòu)的輸出光功率、最大測(cè)量范圍和靈敏度進(jìn)行仿真分析,發(fā)現(xiàn)兩種結(jié)構(gòu)的輸出光功率隨光纖軸心橫向偏移量成近似線性變化關(guān)系,可以用于微位移傳感,并總結(jié)出40μm錐腰直徑的雙錐形結(jié)構(gòu)具有最佳微位移傳感性能。利用該結(jié)構(gòu)在實(shí)驗(yàn)中獲得了至少28微米的最大微位移測(cè)量范圍和-1dB/μm的測(cè)量靈敏度,同時(shí)還實(shí)驗(yàn)證實(shí)了該結(jié)構(gòu)具有良好的溫度穩(wěn)定性。
[Abstract]:The evanescent wave propagation characteristics and structural characteristics of optical fiber cone, as a key component of various photonic devices, play a decisive role in the performance of these modern optical devices.Based on the detailed analysis of optical field transmission and distribution characteristics of optical fiber cone, combined with the strong mode coupling of non-adiabatic fiber cone and the great evanescent wave intensity, the optical fiber cone is applied to micro displacement sensing.The sensing effect of high sensitivity is obtained, which has very important research significance and high market value.The main research results are as follows.The transmission characteristics of adiabatic fiber cone and non adiabatic fiber cone are compared and analyzed based on fiber mode theory. The typical structure and fabrication method of non adiabatic fiber cone are introduced.The mode cutoff condition and the working range of single mode of optical fiber cone are theoretically analyzed.The working characteristics of single mode curved fiber cone and multi mode linear fiber cone are studied by using beam propagation method based on the important structure parameters of cone waist diameter and cone angle.The research includes the distribution of optical field at the output end of fiber cone and the change of mode power.The results show that the beam divergence angle is the largest, the mode coupling efficiency is the highest, and the effective mode field area of the output beam is the largest for single-mode curved fiber with small tapered waist diameter.It lays a foundation for the design and characteristic analysis of micro-displacement sensor based on optical fiber cone.Based on the non-adiabatic optical fiber cone, two new transversal micro-displacement sensing structures are proposed, which are two-cone structure (composed of two fiber cones) and single cone structure (composed of fiber cones and single-mode optical fibers).The output optical power, the maximum measurement range and the sensitivity of the two structures with different tapered waist diameters are simulated and analyzed. It is found that the output optical power of the two structures varies linearly with the transverse deviation of the fiber axis.It can be used in micro-displacement sensing, and it is concluded that the double-cone structure with 40 渭 m tapered waist diameter has the best micro-displacement sensing performance.The maximum microdisplacement measurement range of at least 28 microns and the measuring sensitivity of -1 dB / 渭 m have been obtained by using the structure. At the same time, it has been proved that the structure has good temperature stability.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN253

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