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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.
In this paper, a self-made chalcogenide glass with Ge20Sb15Se65 as matrix material was designed to fabricate a regular octagonal structure dispersion-flattened mid-infrared photonic crystal fiber. The multi-pole method was used to numerically study the mid-infrared dispersion and transmission characteristics. The results show that: The duty cycle of fiber (d / Λ) is between 0.323 and 0.367, and its dispersion and transmission characteristics are adjustable in the range of 3-5μm. When the hole spacing Λ = 3.4μm and hole diameter d = 1.1μm, The dispersion value in the 4.9μm band fluctuates at 0.8-0.8 ps · nm 1 · km 1 with the characteristics of single mode low loss transmission (Loss <0.049dB / m) and small mode field area (Aeff <8.46μm2) Infrared non-linear applications.