光子晶体光纤光栅传感器的研究

发布时间：2018-04-02 02:17

本文选题：光子晶体光纤光栅　切入点：光纤光栅反射谱　出处：《重庆三峡学院》2017年硕士论文

【摘要】：光子晶体光纤光栅是在光纤和光纤光栅的基础上发展起来的新型光无源器件,其同时具有光子晶体光纤和光纤光栅的特性,在光通信和光纤传感领域发挥着极其重要的作用,并不断向前发展。光纤光栅因光子晶体光纤的发展而获得了良好的发展平台。本论文主要针对光子晶体光纤光栅传感器进行了研究,主要从以下几个方面进行了探究:首先对光子晶体光纤光栅的光谱特性进行了研究,应用耦合模理论并结合matlab仿真软件,对光子晶体光纤的结构和光纤光栅的部分参数进行了一定改变,探究了光子晶体光纤光栅纤芯折射率、占空比、调制深度等参数改变对长周期光纤光栅以及光纤布拉格光栅产生的影响。结果表明了对于光子晶体光纤布拉格光栅来说占空比和调制深度的增大,使得波长向长波方向横移;纤芯折射率增大,谐振频率减小,调制深度对谐振频率的影响与其刚好相反。根据前面的理论分析,首先研究了长周期光子晶体光纤光栅的理论模型,通过对耦合模方程进行推导得到了长周期光子晶体光纤光栅的谐振波长表达式;接着根据理论设计了一种弯曲长周期光子晶体光纤光栅传感器模型,分析了所设计的基本模型的工作原理,通过数值分析得到了弯曲长周期光子晶体光纤光栅的h与曲率变化近似成线性关系;并且分别分析了光纤纤芯有效折射率、包层有效折射率、横向应变、纵向应变以及谐振波长的漂移量与光栅的应变、光栅的周期以及弯曲曲率的关系,得出如下结论:纤芯有效折射率和包层的有效折射率因弯曲程度的增加而减小,越是远离中心减小量越大;弯曲程度越大,应变和谐振波长亦随之增大。
[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.
【学位授予单位】：重庆三峡学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253;TP212

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