發(fā)布時間：2019-01-28 11:42

【摘要】：超連續(xù)譜(Supercontinuum, SC)的光譜寬度遠(yuǎn)遠(yuǎn)大于入射光光譜的寬度,在通信,傳感,醫(yī)學(xué)成像等領(lǐng)域具有重要應(yīng)用前景。用于產(chǎn)生超連續(xù)譜的高非線性光纖的設(shè)計和用于放大和傳輸高功率脈沖光源的大有效面積光纖設(shè)計是超連續(xù)譜產(chǎn)生系統(tǒng)的關(guān)鍵技術(shù)。光子晶體光纖(Photonic Crystal Fiber, PCF)因?yàn)槠湫缕娴奶匦远蔀楫a(chǎn)生超連續(xù)譜的理想材料。通過改變光子晶體光纖的相應(yīng)參數(shù),可以獲得普通光纖所不具備的一些新穎光學(xué)特性,如無盡單模、高非線性、單模單偏振、大模場面積等。 本論文在光子晶體光纖的高非線性及大模場面積方面展開了研究,結(jié)合COMSOL Multiphsics軟件和MATLAB進(jìn)行了大量的仿真和計算,在此基礎(chǔ)上對不同工作波長設(shè)計不同的光纖結(jié)構(gòu),并對特定結(jié)構(gòu)的光纖進(jìn)行分析研究。 主要工作如下： 1.對有限元建模過程中應(yīng)考慮的邊界條件進(jìn)行了分析,對常用的幾種邊界條件進(jìn)行了對比與選擇。 2.論文對不同結(jié)構(gòu)的PCF進(jìn)行了研究,包括對不同空氣孔包層尺寸光纖、不同空氣孔數(shù)量的高非線性光纖以及大模場面積光纖進(jìn)行了詳細(xì)的對比研究,為光纖設(shè)計提供了指導(dǎo)。 3.在考慮色散的情況下,論文對常用的三種工作波長分別設(shè)計了不同的高非線性光子晶體光纖結(jié)構(gòu),得到了具有雙零色散的高非線性光子晶體光纖。并對大模場面積的光子晶體光纖進(jìn)行了分析,討論了其模場面積、色散及非線性等特性。
[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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 侯尚林;韓佳巍;強(qiáng)昭s，

本文編號：2417026