本文選題：光子晶體光纖光柵　切入點(diǎn)：光纖光柵反射譜　出處：《重慶三峽學(xué)院》2017年碩士論文

【摘要】：光子晶體光纖光柵是在光纖和光纖光柵的基礎(chǔ)上發(fā)展起來(lái)的新型光無(wú)源器件,其同時(shí)具有光子晶體光纖和光纖光柵的特性,在光通信和光纖傳感領(lǐng)域發(fā)揮著極其重要的作用,并不斷向前發(fā)展。光纖光柵因光子晶體光纖的發(fā)展而獲得了良好的發(fā)展平臺(tái)。本論文主要針對(duì)光子晶體光纖光柵傳感器進(jìn)行了研究,主要從以下幾個(gè)方面進(jìn)行了探究:首先對(duì)光子晶體光纖光柵的光譜特性進(jìn)行了研究,應(yīng)用耦合模理論并結(jié)合matlab仿真軟件,對(duì)光子晶體光纖的結(jié)構(gòu)和光纖光柵的部分參數(shù)進(jìn)行了一定改變,探究了光子晶體光纖光柵纖芯折射率、占空比、調(diào)制深度等參數(shù)改變對(duì)長(zhǎng)周期光纖光柵以及光纖布拉格光柵產(chǎn)生的影響。結(jié)果表明了對(duì)于光子晶體光纖布拉格光柵來(lái)說(shuō)占空比和調(diào)制深度的增大,使得波長(zhǎng)向長(zhǎng)波方向橫移;纖芯折射率增大,諧振頻率減小,調(diào)制深度對(duì)諧振頻率的影響與其剛好相反。根據(jù)前面的理論分析,首先研究了長(zhǎng)周期光子晶體光纖光柵的理論模型,通過(guò)對(duì)耦合模方程進(jìn)行推導(dǎo)得到了長(zhǎng)周期光子晶體光纖光柵的諧振波長(zhǎng)表達(dá)式;接著根據(jù)理論設(shè)計(jì)了一種彎曲長(zhǎng)周期光子晶體光纖光柵傳感器模型,分析了所設(shè)計(jì)的基本模型的工作原理,通過(guò)數(shù)值分析得到了彎曲長(zhǎng)周期光子晶體光纖光柵的h與曲率變化近似成線性關(guān)系;并且分別分析了光纖纖芯有效折射率、包層有效折射率、橫向應(yīng)變、縱向應(yīng)變以及諧振波長(zhǎng)的漂移量與光柵的應(yīng)變、光柵的周期以及彎曲曲率的關(guān)系,得出如下結(jié)論:纖芯有效折射率和包層的有效折射率因彎曲程度的增加而減小,越是遠(yuǎn)離中心減小量越大;彎曲程度越大,應(yīng)變和諧振波長(zhǎng)亦隨之增大。
[Abstract]:Photonic crystal fiber grating is a new type of optical passive device based on fiber and fiber grating. It has the characteristics of photonic crystal fiber and fiber grating, and plays an extremely important role in the field of optical communication and fiber optic sensing. Fiber Bragg grating (FBG) has gained a good development platform because of the development of photonic crystal fiber (PCF). The main contents are as follows: firstly, the spectral characteristics of photonic crystal fiber grating are studied, and the coupling mode theory and matlab simulation software are used. The structure of photonic crystal fiber and some parameters of fiber grating are changed, and the refractive index and duty cycle of photonic crystal fiber grating core are discussed. The effect of modulation depth on long-period fiber grating and fiber Bragg grating. The results show that the increase of duty cycle and modulation depth of photonic crystal fiber Bragg grating makes the wavelength shift to the direction of long wave. The influence of modulation depth on the resonant frequency is opposite to that of the core refractive index. The theoretical model of long-period photonic crystal fiber grating is studied based on the previous theoretical analysis. The resonant wavelength expression of long-period photonic crystal fiber grating is derived from the coupling mode equation, and a model of bending long-period photonic crystal fiber grating sensor is designed according to the theory. The working principle of the designed basic model is analyzed, and the approximate linear relation between h and curvature of the long-period photonic crystal fiber grating is obtained by numerical analysis, and the effective refractive index of fiber core is analyzed respectively. The relationships between the effective refractive index, transverse strain, longitudinal strain and resonant wavelength of the cladding and the strain of the grating, the period of the grating and the curvature of the grating, The following conclusions are drawn: the effective refractive index of the core and the effective refractive index of the cladding decrease with the increase of the bending degree, and the larger the degree of bending, the larger the strain and the resonant wavelength increase.
【學(xué)位授予單位】：重慶三峽學(xué)院
【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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