本文選題：復式晶格三角晶格　切入點：光子帶隙　出處：《南京郵電大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著光通信技術(shù)的飛速發(fā)展,紅外光纖被廣泛應用于工業(yè)、醫(yī)療、軍事等諸多領域,但目前的紅外光纖所用材料有毒、帶隙寬度小和傳輸損耗大,影響其用途。探索一種寬帶隙、低損耗、環(huán)保無毒的紅外光纖具有重要意義。本文設計一種復式三角晶格紅外光子晶體光纖,采用新型Ge30Sb8Se62硫系玻璃的無As環(huán)保材料作為基質(zhì),包層結(jié)構(gòu)由圓形與方形兩種介質(zhì)柱嵌套排列。本文首先應用平面波展開法以及全矢量有限元法分別對復式晶格紅外光子晶體光纖的帶隙特性和損耗特性進行分析,優(yōu)化該紅外光纖的結(jié)構(gòu)參數(shù),結(jié)果表明,占空比d/a?0.75,晶格常數(shù)a=8.37μm,包層數(shù)n=10時,復式晶格紅外光子晶體光纖的性能最優(yōu),其帶隙寬度約為0.523,泄漏損耗值約為0.581dB/km。由于復式晶格紅外光子晶體光纖實際制作過程中難免會引入缺陷,本文對幾種常見的缺陷對該種光子晶體的特性影響進行了研究,結(jié)果表明:隨著空氣柱形變程度的增大,其對應損耗值呈現(xiàn)先增大再減小的周期性規(guī)律;當空氣柱缺陷相同的情況下,其所在位置與纖芯距離越近,對損耗特性的影響就越大;隨著整排空氣柱錯位增大,其對應的損耗值呈現(xiàn)先增大后減小的規(guī)律,并發(fā)現(xiàn)錯位在0.3a~0.7a內(nèi)對應的損耗值較大。該結(jié)果對于復式晶格紅外光子晶體光纖實際制作具有參考價值。本文設計的復式晶格紅外光子晶體光纖帶隙寬、損耗低、機械強度高、紅外透過性好、材料環(huán)保無毒且傳輸性能好,提高了現(xiàn)有紅外光纖的性能,在醫(yī)療以及工業(yè)領域具有廣泛的應用價值。
[Abstract]:With the rapid development of optical communication technology, infrared optical fiber has been widely used in many fields, such as industry, medical treatment, military and so on. It is of great significance to explore a wide band gap, low loss, environmental protection and non-toxic infrared optical fiber. In this paper, an infrared photonic crystal fiber with double triangular lattice is designed, and a new type of as free environmental protection material of Ge30Sb8Se62 sulfur glass is used as the substrate. The cladding structure is arranged by circular and square dielectric columns. In this paper, the band gap and loss characteristics of infrared photonic crystal fiber with complex lattice are analyzed by using plane wave expansion method and full vector finite element method, respectively. The structural parameters of the infrared fiber are optimized. The results show that the duty cycle is d / a? 0.75, the lattice constant a = 8.37 渭 m, the cladding number n = 10:00, the double lattice infrared photonic crystal fiber has the best performance, its band gap width is about 0.523, and the leakage loss value is about 0.581dB / km. the defects will inevitably be introduced in the fabrication process of the composite lattice infrared photonic crystal fiber. In this paper, the influence of several common defects on the properties of the photonic crystal is studied. The results show that the corresponding loss value increases first and then decreases with the increase of the deformation degree of the air column. When the air column defects are the same, the closer the distance between the air column and the core, the greater the influence on the loss characteristics, and with the increase of the dislocation of the whole air column, the corresponding loss value increases first and then decreases. It is also found that the value of loss corresponding to the dislocation within 0.3a ~ 0.7a is large. This result is of reference value for the practical fabrication of the composite lattice infrared photonic crystal fiber. The band gap of the complex lattice infrared photonic crystal fiber designed in this paper is wide, the loss is low, and the mechanical strength is high. The infrared transmittance is good, the material is environmentally friendly and non-toxic, and the transmission performance is good. It improves the performance of the existing infrared fiber and has wide application value in the medical and industrial fields.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN253

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本文編號：1606999