光纤锥的倏逝波特性及传感应用研究

发布时间：2018-04-15 02:16

本文选题：光纤锥 + 倏逝波特性　；参考：《北京交通大学》2017年硕士论文

【摘要】：光纤锥作为多种光子器件的关键组成部分,其倏逝波传输特性和结构特性都对这些现代光学器件的工作性能起到决定性作用。论文中基于对光纤锥光场传输和分布特性深入细致的分析,并结合非绝热型光纤锥较强的模式耦合作用和极大的倏逝波强度,将光纤锥应用于微位移传感,获得了较高灵敏度的传感效果,具有非常重要的研究意义和较高的市场价值。主要的研究成果如下。1.结合光纤模式理论对比分析了绝热型光纤锥和非绝热型光纤锥的传输特性,并对非绝热型光纤锥的典型结构和制作方法进行了介绍。2.对光纤锥的模式截止条件以及单模工作范围进行了理论分析,并运用光束传播法基于锥腰直径和锥角两个光纤锥的重要结构参数分别对单模曲面光纤锥和多模直线型光纤锥的工作特性展开了研究,研究内容包括光纤锥输出端面处的光场分布及模式功率的变化等。研究结果表明:具有较小锥腰直径的单模曲面光纤锥出射的波束发散角最大,模式耦合效率最高,输出波束的有效模场面积最大,为后续对基于光纤锥的微位移传感应用的设计与特性分析奠定了基础。3.基于非绝热型光纤锥提出了两种新型的横向微位移传感结构,分别是双锥结构(由两个光纤锥相对组成)和单锥结构(由光纤锥和单模光纤组成)。通过对不同锥腰直径下两种结构的输出光功率、最大测量范围和灵敏度进行仿真分析,发现两种结构的输出光功率随光纤轴心横向偏移量成近似线性变化关系,可以用于微位移传感,并总结出40μm锥腰直径的双锥形结构具有最佳微位移传感性能。利用该结构在实验中获得了至少28微米的最大微位移测量范围和-1dB/μm的测量灵敏度,同时还实验证实了该结构具有良好的温度稳定性。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253

【参考文献】