光子晶体光纤光栅的光谱特性及其传感应用

发布时间：2018-05-08 06:47

本文选题：光子晶体光纤光栅 + 椭圆形　；参考：《南京邮电大学》2017年硕士论文

【摘要】：光子晶体光纤光栅(PCFG)是一种结构特殊、发展迅速的光纤无源器件。与传统光纤相比,其抗电磁干扰、体积小、损耗低等诸多优势,在光通信和光传感领域被广泛的应用。本文利用COMSOL软件设计出两种新型光子晶体光纤结构模型,对比分析其模场特性、双折射特性,选择性能更优的结构重点分析。使用MATLAB软件对该光子晶体光纤光栅在不同结构参数下及外界环境变化下的光谱特性及传感特性进行仿真分析。运用COMSOL软件设计了两种新型光子晶体光纤光栅结构,对比分析了两者在相同结构参数下的模场特性及双折射特性。选择性能更优的包层为椭圆空气孔结构的光子晶体光纤作为研究对象,分析纤芯圆半径、包层椭圆率对其双折射及损耗特性的影响。将COMSOL仿真得到的数据与MATLAB相结合,得出了该结构在不同光栅长度、不同调制深度下的波长与谱特性的变化关系。研究结果表明:随着光栅长度、调制深度的增大,该结构光子晶体光纤布拉格光栅的反射谱会逐渐增大,但增量逐渐减小,在光栅调制深度为4-100.2?处,光栅的反射率达到最大。由此可见,可以通过设置合适的光子晶体光纤布拉格光栅的光栅长度、调制深度等参数,得到实际所需的反射率。运用基于传输矩阵法理论的MATLAB仿真软件,对该包层结构为椭圆形空气孔的光子晶体光纤光栅在不同温度、应变下的传感特性进行分析。仿真结果表明:随着温度的增大,该结构光子晶体光纤光栅光谱的谐振波长均向长波长方向漂移,且趋势较为明显;随着应变的增大,光谱的谐振波长虽然也向长波长方向漂移,但漂移量很小,可以忽略不计。由此可见,该结构光子晶体光纤光栅适合用于制作温度传感器。
[Abstract]:Photonic crystal fiber grating (PCFG) is a kind of fiber passive device with special structure and rapid development. Compared with traditional optical fiber, it has many advantages, such as anti-electromagnetic interference, small volume, low loss and so on. It is widely used in optical communication and optical sensing field. In this paper, two new photonic crystal fiber structure models are designed by using COMSOL software. The mode field characteristics and birefringence characteristics of the photonic crystal fiber are compared and analyzed. The spectral and sensing characteristics of the photonic crystal fiber grating under different structure parameters and changes of external environment are simulated and analyzed by MATLAB software. Two novel photonic crystal fiber grating structures are designed by using COMSOL software. The mode field and birefringence characteristics of the two gratings under the same structure parameters are compared and analyzed. A photonic crystal fiber with elliptical air pore structure is selected as the research object. The effects of core radius and cladding ellipticity on its birefringence and loss characteristics are analyzed. The relationship between wavelength and spectral characteristics of the structure under different grating length and modulation depth is obtained by combining the data obtained from COMSOL simulation with MATLAB. The results show that with the increase of grating length and modulation depth, the reflection spectrum of the structure photonic crystal fiber Bragg grating will gradually increase, but the increment will gradually decrease, at the grating modulation depth of 4-100.2? The maximum reflectivity of the grating is obtained. It can be seen that the required reflectivity can be obtained by setting appropriate parameters such as grating length and modulation depth of photonic crystal fiber Bragg grating. Using the MATLAB simulation software based on the transfer matrix method, the sensing characteristics of the photonic crystal fiber grating with elliptical air holes at different temperature and strain are analyzed. The simulation results show that the resonant wavelength of the structure photonic crystal fiber grating spectrum drifts along the direction of long wavelength with the increase of temperature, and the trend is obvious with the increase of strain. The resonant wavelength of the spectrum drifts towards the long wavelength, but the drift is very small and can be ignored. It can be seen that the structure of photonic crystal fiber grating is suitable for the fabrication of temperature sensors.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253

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