新型双芯光子晶体光纤理论及特性研究

发布时间：2018-01-12 23:03

本文关键词：新型双芯光子晶体光纤理论及特性研究　出处：《天津理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：光子晶体光纤有着许多单模光纤所不具有的特性,随着光子晶体光纤理论分析方法的成熟和制作方法的不断完善,各种各样的光子晶体光纤不断涌现。传统石英双芯光纤因为制作比较繁琐,而且对加工的技术要求比较高的缺点,所以双芯光子晶体光纤不但在制作过程比较简单,还具有优良的耦合特性。因此,光子晶体光纤对现代集成光学的意义也愈发重要。本文以双芯光子晶体光纤为研究对象,设计和分析了两种不同结构参数下双芯光子晶体光纤,通过应用全矢量有限元法分别对设计的双芯PCF耦合长度和宽带平坦色散特性以及基于铅硅酸盐材料双芯光子晶体光纤在偏振分束器中的应用进行了相关的分析。本文的具体工作内容如下:(1)详细介绍了双芯光子晶体光纤的导光原理以及与传统单模光纤的区别和优势,并且阐述了双芯光子晶体光纤的分类以及制备,归纳并总结了双芯光子晶体光纤国内外的研究现状。(2)介绍了双芯光子晶体光纤的不同理论分析方法,着重介绍了本文所使用的全矢量有限元法的基本原理,说明了COMSOL软件进行仿真的方法和步骤。最后,还介绍了光子晶体光纤的几种基本特性。(3)提出了一种新型椭圆孔的高双折射以及宽带平坦色散双芯光子晶体光纤,通过在两个纤芯附近引入六个椭圆孔构成不对称性从而提高模式双折射,并且应用全矢量有限元法对设计光纤的耦合特性以及色散特性进行数值仿真模拟研究。优化分析结果表明,通过改变光纤内部的结构参数,这种新型双芯PCF的模式双折射可以达到210?量级;对应x的偏振态的耦合长度为68.178?m,对应y的偏振态的耦合长度为74.825?m;在传输波长1.1~1.60?m的范围内具有宽带平坦色散特性。(4)提出了一种基于铅硅酸盐玻璃的新型双芯PCF偏振分束器,而且和具有同结构的石英玻璃双芯PCF偏振分束器的相关特性进行比较。通过优化分析表明,这种新型材料偏振分束器具有耦合损耗极低和更高的消光比,在工作波长为1.55?m,光纤长度是688?m,耦合损耗为0.0019d B;纤芯A消光比为-64.1d B,消光比小于-20d B带宽为51nm。
[Abstract]:Photonic crystal fiber (PCF) has many characteristics which single mode fiber does not have. With the maturity of theoretical analysis method and the improvement of fabrication method of PCF. A variety of photonic crystal fibers are emerging. The traditional quartz double-core fiber has the disadvantages of complicated fabrication and high technical requirements. Therefore, the two-core photonic crystal fiber is not only simple in the fabrication process, but also has excellent coupling characteristics. Photonic crystal fiber (PCF) is becoming more and more important to modern integrated optics. In this paper, two kinds of PCF with different structure parameters are designed and analyzed. By using full vector finite element method, the coupling length and wideband flat dispersion characteristics of dual-core PCF and the application of two-core photonic crystal fiber based on lead silicate in polarizing beam splitter are analyzed. The contents of this paper are as follows:. (. 1) the principle of light conduction of two-core photonic crystal fiber is introduced in detail, and the differences and advantages between it and traditional single-mode fiber are also discussed. And the classification and preparation of two-core photonic crystal fiber are described. The research status of two-core photonic crystal fiber at home and abroad is summarized. (2) the different theoretical analysis methods of two-core photonic crystal fiber are introduced. The basic principle of full vector finite element method used in this paper is introduced emphatically, and the method and procedure of simulation with COMSOL software are explained. Finally. Several basic properties of photonic crystal fiber (PCF) are also introduced. A new type of high birefringence and broadband flat dispersion photonic crystal fiber with high birefringence and wide band flat dispersion is proposed. The mode birefringence is improved by introducing six elliptical holes near the two cores to form asymmetry. The full vector finite element method is used to simulate the coupling characteristics and dispersion characteristics of the designed fiber. The results of optimization analysis show that the structural parameters of the fiber are changed by changing the internal structure parameters. The mode birefringence of this new dual-core PCF can reach 210? The coupling length of the polarized state corresponding to x is 68.178? M, the coupling length of the polarization state corresponding to y is 74.825? M; at the transmission wavelength of 1.1 ~ 1.60? A novel dual-core PCF polarizing beam splitter based on lead-silicate glass is proposed. And compared with the quartz glass dual-core PCF polarizer with the same structure, the optimization analysis shows that the new material polarizing beam splitter has very low coupling loss and higher extinction ratio. At the operating wavelength of 1.55? M, the length of the fiber is 688? The coupling loss is 0.0019 dB, the extinction ratio of fiber core A is -64.1 dB, the extinction ratio is less than -20 dB and the bandwidth is 51 nm.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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