【摘要】：光纖通信已成為現(xiàn)代通信的主要支柱，在現(xiàn)代通信網(wǎng)絡(luò)中有著舉足輕重的地位，而光纖則是其最主要的傳輸媒介。光子晶體光纖，作為一種新穎的微結(jié)構(gòu)光纖，由于有著許多奇異的特性，比如說：無截止單模特性、高雙折射率、低限制損耗、平坦色散等，而這些特性都超越了普通光纖，因此自1996年問世以來就受到世界各地科研人員的廣泛關(guān)注。所以研究光子晶體光纖的性能參數(shù)及其傳輸特性就顯得十分重要。本文著重于新穎光子晶體光纖的結(jié)構(gòu)設(shè)計與特性研究，主要的工作內(nèi)容如下： （1）分析了光子晶體光纖各種新穎的特性，同時還詳細介紹了最常用的拉制光子晶體光纖的方法-堆積法及其工藝流程。 （2）本論文采用了全矢量有限元法和平面波展開法，以及各向異性完美匹配邊界條件等算法來研究光子晶體光纖的傳輸特性，為后面的晶體光纖結(jié)構(gòu)設(shè)計提供了理論思想和數(shù)學(xué)依據(jù)。 （3）根據(jù)光子晶體光纖特性的變化規(guī)律設(shè)計了一種新型正方形纖芯混合包層光子晶體光纖，分析了它的結(jié)構(gòu)參數(shù)對光纖的色散、限制損耗等特性的影響，并由此取得了最優(yōu)化參數(shù)值。這種光纖在1.32μm到1.64μm（320nm波段范圍內(nèi)）有著超平坦色散，，且限制損耗低于10-7dB/m，與此同時，該光纖的結(jié)構(gòu)參數(shù)在制作過程中發(fā)生微小變化時，光纖的色散和限制損耗等特性不會發(fā)生突變。 （4）設(shè)計了一種有著良好的單模傳輸特性、高雙折射率的光子晶體光纖。將傳統(tǒng)光纖中平行于x軸的圓形空氣孔換成橢圓形且空氣孔中填充二氧化硅，并向左旋轉(zhuǎn)角度45°，而在平行于y軸的空氣孔中，將圓形空氣孔換成橢圓形空氣孔并向另一方向旋轉(zhuǎn)45°，但不填充任何物質(zhì)，里面只是填充空氣，這種結(jié)構(gòu)可以極大提高雙折射率，并打破了光子晶體光纖的對稱結(jié)構(gòu)。研究結(jié)果表明所設(shè)計的光纖在1.55μm處雙折射率高達4.65×10-2，且單模傳輸?shù)慕刂共ㄩL只有0.6122μm，同時在1.55μm波長處有著6.4×10-6dB/m的較低限制損耗。
[Abstract]:Optical fiber communication has become the main pillar of modern communication and plays an important role in modern communication network, and optical fiber is the most important transmission medium. Photonic crystal fiber (PCF), as a novel microstructured fiber, has many unique properties, such as uncut single mode, high birefringence, low limiting loss, flat dispersion and so on. Since its inception in 1996, researchers all over the world have paid close attention to it. Therefore, it is very important to study the performance parameters and transmission characteristics of photonic crystal fiber. This paper focuses on the structure design and characteristics of novel photonic crystal fiber. The main work is as follows: (1) the novel properties of photonic crystal fiber are analyzed. At the same time, the most commonly used method of drawing photonic crystal fiber, the stacking method and its technological process, are introduced in detail. (2) the full vector finite element method and plane wave expansion method are used in this thesis. And the anisotropic perfectly matched boundary conditions are used to study the propagation characteristics of photonic crystal fibers. It provides a theoretical and mathematical basis for the structure design of the crystal fiber. (3) according to the characteristics of photonic crystal fiber, a new type of square-core hybrid cladding photonic crystal fiber is designed. The influence of the structure parameters on the dispersion and limiting loss of the fiber is analyzed, and the optimum parameters are obtained. The fiber has ultra-flat dispersion from 1.32 渭 m to 1.64 渭 m (in the 320nm band), and the limiting loss is less than 10-7 dB / m. At the same time, the structural parameters of the fiber vary slightly during the fabrication process. The dispersion and limiting loss of the fiber will not change. (4) A high birefringence photonic crystal fiber with good single-mode transmission characteristics is designed. The circular air holes parallel to the x axis in conventional optical fibers are replaced with elliptical and air holes filled with silicon dioxide and rotated at an angle of 45 擄to the left, while in air holes parallel to the y axis, The circular air hole is replaced by an elliptical air hole and rotates 45 擄in the other direction, but it is filled with no matter. This structure can greatly improve the birefringence and break the symmetry structure of photonic crystal fiber. The results show that the designed fiber has a birefringence of 4.65 脳 10 ~ (-2) at 1.55 渭 m, a cut-off wavelength of only 0.6122 渭 m and a low limiting loss of 6.4 脳 10-6dB/m at 1.55 渭 m.
【學(xué)位授予單位】：華東交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

【參考文獻】

相關(guān)博士學(xué)位論文 前1條

1 史青;光子晶體光纖及其在傳感領(lǐng)域的應(yīng)用研究[D];南開大學(xué);2010年

本文編號：2182936