本文關鍵詞：新型雙芯光子晶體光纖理論及特性研究　出處：《天津理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 光子晶體光纖 色散 偏振分束器 消光比 全矢量有限元法

【摘要】：光子晶體光纖有著許多單模光纖所不具有的特性,隨著光子晶體光纖理論分析方法的成熟和制作方法的不斷完善,各種各樣的光子晶體光纖不斷涌現(xiàn)。傳統(tǒng)石英雙芯光纖因為制作比較繁瑣,而且對加工的技術要求比較高的缺點,所以雙芯光子晶體光纖不但在制作過程比較簡單,還具有優(yōu)良的耦合特性。因此,光子晶體光纖對現(xiàn)代集成光學的意義也愈發(fā)重要。本文以雙芯光子晶體光纖為研究對象,設計和分析了兩種不同結構參數(shù)下雙芯光子晶體光纖,通過應用全矢量有限元法分別對設計的雙芯PCF耦合長度和寬帶平坦色散特性以及基于鉛硅酸鹽材料雙芯光子晶體光纖在偏振分束器中的應用進行了相關的分析。本文的具體工作內(nèi)容如下:(1)詳細介紹了雙芯光子晶體光纖的導光原理以及與傳統(tǒng)單模光纖的區(qū)別和優(yōu)勢,并且闡述了雙芯光子晶體光纖的分類以及制備,歸納并總結了雙芯光子晶體光纖國內(nèi)外的研究現(xiàn)狀。(2)介紹了雙芯光子晶體光纖的不同理論分析方法,著重介紹了本文所使用的全矢量有限元法的基本原理,說明了COMSOL軟件進行仿真的方法和步驟。最后,還介紹了光子晶體光纖的幾種基本特性。(3)提出了一種新型橢圓孔的高雙折射以及寬帶平坦色散雙芯光子晶體光纖,通過在兩個纖芯附近引入六個橢圓孔構成不對稱性從而提高模式雙折射,并且應用全矢量有限元法對設計光纖的耦合特性以及色散特性進行數(shù)值仿真模擬研究。優(yōu)化分析結果表明,通過改變光纖內(nèi)部的結構參數(shù),這種新型雙芯PCF的模式雙折射可以達到210?量級;對應x的偏振態(tài)的耦合長度為68.178?m,對應y的偏振態(tài)的耦合長度為74.825?m;在傳輸波長1.1~1.60?m的范圍內(nèi)具有寬帶平坦色散特性。(4)提出了一種基于鉛硅酸鹽玻璃的新型雙芯PCF偏振分束器,而且和具有同結構的石英玻璃雙芯PCF偏振分束器的相關特性進行比較。通過優(yōu)化分析表明,這種新型材料偏振分束器具有耦合損耗極低和更高的消光比,在工作波長為1.55?m,光纖長度是688?m,耦合損耗為0.0019d B;纖芯A消光比為-64.1d B,消光比小于-20d B帶寬為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.
【學位授予單位】：天津理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN253

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