Abstract
运用平面波展开法分析As2S3、Ge20Se65Sb15和As2Se3硫系玻璃光纤在不同空气填充率下的带隙分布图, 分析结果表明三种材料在空气填充率提高到0.75时, 光子带隙与空气线均出现交汇模式, 且带隙宽度大, 纤芯空气孔中适宜进行激光传输.运用有限元法分析不同纤芯孔直径的Ge20Se65Sb15硫系玻璃空芯光子带隙光纤的基模限制损耗和有效模场面积, 结果表明纤芯直径9.2 μm时限制损耗最低, 模场面积较小.通过优化光纤的结构参量, 适合于4.3 μm波长处高功率中红外激光传输的空芯光子带隙光纤, 其限制损耗为0.00472 dB/m, 有效模场面积为58.046 μm2.
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