复式晶格红外光子晶体光纤的设计与性能分析

发布时间：2018-03-13 15:30

本文选题：复式晶格三角晶格　切入点：光子带隙　出处：《南京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着光通信技术的飞速发展,红外光纤被广泛应用于工业、医疗、军事等诸多领域,但目前的红外光纤所用材料有毒、带隙宽度小和传输损耗大,影响其用途。探索一种宽带隙、低损耗、环保无毒的红外光纤具有重要意义。本文设计一种复式三角晶格红外光子晶体光纤,采用新型Ge30Sb8Se62硫系玻璃的无As环保材料作为基质,包层结构由圆形与方形两种介质柱嵌套排列。本文首先应用平面波展开法以及全矢量有限元法分别对复式晶格红外光子晶体光纤的带隙特性和损耗特性进行分析,优化该红外光纤的结构参数,结果表明,占空比d/a?0.75,晶格常数a=8.37μm,包层数n=10时,复式晶格红外光子晶体光纤的性能最优,其带隙宽度约为0.523,泄漏损耗值约为0.581dB/km。由于复式晶格红外光子晶体光纤实际制作过程中难免会引入缺陷,本文对几种常见的缺陷对该种光子晶体的特性影响进行了研究,结果表明:随着空气柱形变程度的增大,其对应损耗值呈现先增大再减小的周期性规律;当空气柱缺陷相同的情况下,其所在位置与纤芯距离越近,对损耗特性的影响就越大;随着整排空气柱错位增大,其对应的损耗值呈现先增大后减小的规律,并发现错位在0.3a~0.7a内对应的损耗值较大。该结果对于复式晶格红外光子晶体光纤实际制作具有参考价值。本文设计的复式晶格红外光子晶体光纤带隙宽、损耗低、机械强度高、红外透过性好、材料环保无毒且传输性能好,提高了现有红外光纤的性能,在医疗以及工业领域具有广泛的应用价值。
[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.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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