折射率引导型硫系玻璃光子晶体光纤的制备及性能研究

发布时间：2018-05-15 05:38

本文选题：红外 + 硫系玻璃　；参考：《宁波大学》2015年硕士论文

【摘要】：光子晶体光纤(Photonic Crystal Fiber,简称PCF)是以光子晶体的基本特性为基础而发展起来的一种新型光纤。由于它对在光纤中传导的光线具有不同于传统芯包层结构光纤的非常灵活的限制能力,PCF正逐步应用于光纤通信,光纤传感,光纤激光器,非线性光器件等诸多新兴研究领域。折射率引导型光子晶体光纤(Refractive Index Guiding PCF)是一种包层气孔辅助调节型光纤,通过对这类光纤包层中空气孔的数量和分布进行调节就可以降低包层相对于纤芯的折射率,从而实现全内反射传输条件。折射率引导型PCF可以被认为是通常意义下的微结构光纤的一个分支,它不单是利用芯包层的折射率差值来实现光的传导,更为重要的意义是它可以通过灵活的结构设计来控制光的合理传导。硫系玻璃通常是以硫、硒、碲三种硫族元素为基质,再加入砷、锗、镓等化学元素组成的玻璃材料。硫系玻璃具有优良的红外透过特性,与硫系玻璃光纤相关的研究一直备受关注。本论文研究了折射率引导型硫系PCF的制备方法和相关的光纤光学性能,主要论述了以下几个方面:(1)对比较成熟的Se基玻璃进行了改良,通过碘掺杂制备了一类新型硫系玻璃材料Ge20Sb5Se75-xIx(x=0,5,10,15,20 at%)。这类玻璃通过降低Se基玻璃的弱吸收尾强度,非常有效地提高了红外透过率。利用拉曼光谱揭示了该玻璃体系随碘含量的提高其内部玻璃结构的变化机理。利用其他相关的测试方法,我们还对该玻璃体系的物理,热学以及光学特性进行了深入分析。在相关研究的基础上,提出了一种可行的蒸馏提纯工艺并成功地对Ge-Sb-Se-I玻璃进行了提纯,经过提纯,非常有效地降低了与Ge-O、H2O、Se-H相关的杂质吸收峰。(2)硫系光纤预制棒的加热拉丝工艺是确保PCF制备成功的必备环节。在硫系预制棒加热拉丝工艺方面,利用提纯后的Ge20Sb5Se55I20玻璃研究了裸丝硫系光纤的拉制工艺并对Ge20Sb5Se55I20红外光纤进行了相关测试。研究结果表明:与Ge-Sb-Se玻璃光纤相比,Ge-Sb-Se-I光纤的有效红外传输损耗有了大幅度的降低。Ge20Sb5Se55I20光纤在3.3μm处可以得到最低红外传输损耗3.5d B/m,而Ge20Sb5Se75光纤最低损耗则高达48d B/m。(3)硫系PCF制备的难点在于PCF预制棒的制备工艺。在光纤预制棒制备工艺方面,提出了一种先进的预制棒制备方法-隔离挤压法,从而为挤压制备硫系PCF空心玻璃管单元打下了基础。使用这种方法制得了Ge-Sb-Se/Ge-Sb-S硫系玻璃预制棒,在整个160mm长度范围内预制棒均能保持纤芯/包层尺寸比例的一致性。经过预制棒加热拉丝法制成的红外硫系光纤,常见的典型结构缺陷(气泡,裂纹,芯径变化)被有效去除。使用相关光学仪器,对光纤传输损耗,弯曲损耗以及其他光学特性进行了表征。(4)在利用多极法优化设计光子晶体光纤结构的基础上,充分结合挤压和堆积两种PCF预制棒制备方法的优点,提出了一种基于“挤压-堆积”的新型折射率引导型PCF预制棒制备方法,利用As2S3玻璃制备了三层孔环结构硫系PCF。通过理论模拟分析得出了该光纤的色散特性、零色散点和非线性系数,测试了1550nm近红外光纤激光在该光纤中的传输效果和纤芯光斑能量分布,利用该光斑测试验证了该光纤在红外波段的光能传输局部限制能力。
[Abstract]:Photonic Crystal Fiber (PCF) is a new type of fiber developed on the basis of the basic characteristics of photonic crystals. Because it has a very flexible ability to restrict the light transmission in the optical fiber from the traditional core cladding fiber, PCF is gradually applied to optical fiber communication, fiber sensing, fiber excitation. The refractive index guided photonic crystal fiber (Refractive Index Guiding PCF) is a clad hole auxiliary regulating fiber. By adjusting the number and distribution of hollow pores in this kind of cladding, the refractive index of the cladding relative to the core can be reduced so as to realize all inside. Reflection transmission conditions. The refractive index guided PCF can be considered as a branch of the usual microstructural fiber. It is not only the use of the refractive index difference of the core layer to achieve light transmission. It is more important that it can control the reasonable transmission of light by flexible structural design. Sulfur, selenium and tellurium are usually used in sulphur system glass. Three kinds of sulfur elements are used as matrix, and then glass materials such as arsenic, germanium, gallium and other chemical elements are added. Sulfur based glass has excellent infrared transmittance. The research on sulfur based glass fiber has been paid much attention. In this paper, the preparation methods and optical fiber optical properties of the refractive index guided sulfur system PCF are studied and the following are discussed. Several aspects: (1) the mature Se based glass was improved and a new type of sulfur based glass material Ge20Sb5Se75-xIx (x=0,5,10,15,20 at%) was prepared by iodine doping. This kind of glass improved the infrared penetration rate very effectively by reducing the weak absorption tail strength of the Se based glass. In addition, the physical, thermal and optical properties of the glass system were further analyzed by other related testing methods. On the basis of the related research, a feasible distillation process was proposed and the Ge-Sb-Se-I glass was successfully purified and purified. The absorption peaks related to Ge-O, H2O and Se-H are often effectively reduced. (2) the heating and drawing process of the sulfur based optical fiber preform is a necessary link to ensure the success of the PCF preparation. In the heating and drawing process of the sulfur system preform, the drawing process of the naked silk sulfur system fiber and the Ge20Sb5Se55I20 infrared light are studied by the purified Ge20Sb5Se55I20 glass. The results show that compared with the Ge-Sb-Se glass fiber, the effective infrared transmission loss of the Ge-Sb-Se-I fiber has a significant reduction in the.Ge20Sb5Se55I20 fiber at 3.3 mu m, the lowest infrared transmission loss 3.5D B/m, while the minimum loss of the Ge20Sb5Se75 fiber is as high as 48D B/m. (3) sulfur system PCF preparation. In the preparation process of PCF preform. In the preparation of optical fiber preform, an advanced preform preparation method, isolation extrusion method, was put forward to prepare the sulfur based PCF hollow glass tube unit by extrusion. The Ge-Sb-Se/Ge-Sb-S sulphur glass preform was prepared by this method and prefabricated in the whole range of 160mm length. The rod can keep the consistency of the size ratio of the core / cladding. The common typical structural defects (bubbles, cracks, core diameter changes) are effectively removed by the prefabricated rod heating and drawing. The optical fiber transmission loss, bending loss and other optical properties are characterized by using the related optical instruments. (4) the use of multipoles is used. On the basis of optimizing the structure of photonic crystal fiber and combining the advantages of extrusion and accumulation of two kinds of PCF preform, a new method of preparing a new type of PCF preform based on "extrusion and accumulation" is proposed. The three layers of Kong Huan structure sulfur system PCF. is prepared by theoretical simulation and analysis by using As2S3 glass. The dispersion characteristic, zero dispersion point and nonlinear coefficient of the fiber are tested. The transmission effect of 1550nm near infrared optical fiber laser in this fiber and the energy distribution of the core light spot are tested. The local limiting ability of the optical fiber in the infrared wave band is verified by the light spot test.

【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

【参考文献】