用于超连续谱产生的特种光纤关键技术的研究
发布时间：2019-01-28 11:42
【摘要】：超连续谱(Supercontinuum, SC)的光谱宽度远远大于入射光光谱的宽度,在通信,传感,医学成像等领域具有重要应用前景。用于产生超连续谱的高非线性光纤的设计和用于放大和传输高功率脉冲光源的大有效面积光纤设计是超连续谱产生系统的关键技术。光子晶体光纤(Photonic Crystal Fiber, PCF)因为其新奇的特性而成为产生超连续谱的理想材料。通过改变光子晶体光纤的相应参数,可以获得普通光纤所不具备的一些新颖光学特性,如无尽单模、高非线性、单模单偏振、大模场面积等。 本论文在光子晶体光纤的高非线性及大模场面积方面展开了研究,结合COMSOL Multiphsics软件和MATLAB进行了大量的仿真和计算,在此基础上对不同工作波长设计不同的光纤结构,并对特定结构的光纤进行分析研究。 主要工作如下： 1.对有限元建模过程中应考虑的边界条件进行了分析,对常用的几种边界条件进行了对比与选择。 2.论文对不同结构的PCF进行了研究,包括对不同空气孔包层尺寸光纤、不同空气孔数量的高非线性光纤以及大模场面积光纤进行了详细的对比研究,为光纤设计提供了指导。 3.在考虑色散的情况下,论文对常用的三种工作波长分别设计了不同的高非线性光子晶体光纤结构,得到了具有双零色散的高非线性光子晶体光纤。并对大模场面积的光子晶体光纤进行了分析,讨论了其模场面积、色散及非线性等特性。
[Abstract]:The spectral width of supercontinuum (Supercontinuum, SC) is much larger than that of incident light, so it has an important application prospect in communication, sensing, medical imaging and other fields. The design of high nonlinear fiber used to generate supercontinuum spectrum and the design of large effective area fiber used to amplify and transmit high power pulse light source are the key technologies of supercontinuum spectrum generation system. Photonic crystal fiber (Photonic Crystal Fiber, PCF) is an ideal material for producing supercontinuum because of its novel properties. By changing the corresponding parameters of photonic crystal fiber, some novel optical properties, such as endless single mode, high nonlinear, single mode single polarization, large mode field area and so on, can be obtained. In this paper, the high nonlinearity and large mode field area of photonic crystal fiber are studied, and a lot of simulation and calculation are carried out with COMSOL Multiphsics software and MATLAB. On this basis, different optical fiber structures are designed for different working wavelengths. The fiber with specific structure is analyzed and studied. The main work is as follows: 1. The boundary conditions that should be considered in the process of finite element modeling are analyzed, and several commonly used boundary conditions are compared and selected. 2. In this paper, PCF with different structure is studied in detail, including different air hole cladding fiber, high nonlinear fiber with different air hole number and large mode field area fiber, which provides guidance for fiber design. 3. Under the condition of considering dispersion, different structures of high nonlinear photonic crystal fibers are designed for three commonly used wavelengths, and high nonlinear photonic crystal fibers with double zero dispersion are obtained. The photonic crystal fiber with large mode field area is analyzed, and the characteristics of mode field area, dispersion and nonlinearity are discussed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
[Abstract]:The spectral width of supercontinuum (Supercontinuum, SC) is much larger than that of incident light, so it has an important application prospect in communication, sensing, medical imaging and other fields. The design of high nonlinear fiber used to generate supercontinuum spectrum and the design of large effective area fiber used to amplify and transmit high power pulse light source are the key technologies of supercontinuum spectrum generation system. Photonic crystal fiber (Photonic Crystal Fiber, PCF) is an ideal material for producing supercontinuum because of its novel properties. By changing the corresponding parameters of photonic crystal fiber, some novel optical properties, such as endless single mode, high nonlinear, single mode single polarization, large mode field area and so on, can be obtained. In this paper, the high nonlinearity and large mode field area of photonic crystal fiber are studied, and a lot of simulation and calculation are carried out with COMSOL Multiphsics software and MATLAB. On this basis, different optical fiber structures are designed for different working wavelengths. The fiber with specific structure is analyzed and studied. The main work is as follows: 1. The boundary conditions that should be considered in the process of finite element modeling are analyzed, and several commonly used boundary conditions are compared and selected. 2. In this paper, PCF with different structure is studied in detail, including different air hole cladding fiber, high nonlinear fiber with different air hole number and large mode field area fiber, which provides guidance for fiber design. 3. Under the condition of considering dispersion, different structures of high nonlinear photonic crystal fibers are designed for three commonly used wavelengths, and high nonlinear photonic crystal fibers with double zero dispersion are obtained. The photonic crystal fiber with large mode field area is analyzed, and the characteristics of mode field area, dispersion and nonlinearity are discussed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
【参考文献】
相关期刊论文 前8条
1 侯尚林;韩佳巍;强昭s，
本文编号：2417026
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