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中文摘要：
本文以自制Ge20Sb15Se65硫系玻璃为基质材料,设计一种正八边形结构色散平坦型中红外硫系光子晶体光纤,并采用多极法对其中红外色散和传输特性进行数值研究.结果表明：控制该光纤占空比（d/Λ）在0.323—0.367之间,其色散及传输特性在3—5μm范围内可调.当孔间距Λ=3.4μm,孔直径d=1.1μm时,光纤在4.1—4.9μm波段的色散值在0.8—0.8 ps·nm 1·km 1波动,且具备单模低损耗传输（Loss〈0.049dB/m）,小模场面积（Aeff〈8.46μm2）特性,适合于中红外非线性应用领域.
英文摘要：
In this paper,using the self-made Ge20 Sb15 Se65 chalcogenide glass as matrix material,we design an infrared octagon dispersion fattened photonic crystal fber,and the mid-IR dispersion and transmission characteristics are numerically studied using the multipole method.Results show that when we control the duty ratio（d/Λ） in 0.323—0.367,the dispersion and transmission properties in the 3—5 μm range are adjustable.When we set the hole spacing Λ = 3.4 μm,hole diameter d = 1.1 μm,in the 4.1—4.9 μm band,the fber dispersion fuctuates between 0.8 ps·nm 1·km 1and 0.8 ps·nm 1·km 1,and shows single-mode transmission,low loss（Loss0.049 dB/m）,small mode area（Aeff 8.46 μm2） characteristics,thus it is suitable for nonlinear applications in mid-IR band.
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