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设计了一种中红外硫系玻璃双芯光子晶体光纤,利用多极法和模式耦合基本理论研究了这种光纤的耦合特性.数值模拟发现,空气孔间距Λ=5.4μm,空气孔半径为r=1.35μm,空气填充率d/Λ=0.5的光纤,在归一化波长λ/Λ=2.04μm处双折射可以达到0.551×10-2,在归一化波长λ/Λ=0.93μm处x偏振方向的耦合长度为145.32μm,y偏振方向的耦合长度为154.68μm.本文将波段扩展到中红外,将耦合长度与高保偏特性相结合的双芯光子晶体光纤对中红外波段光纤耦合器的研制具有重要意义.
A kind of middle-infrared chalcogenide glass dual-core photonic crystal fiber is designed and the coupling characteristics of the fiber are studied by using the theory of multipole method and mode coupling.The numerical simulation shows that the air hole spacing Λ is 5.4μm and the air hole radius is r = 1.35μm and the air filling rate d / Λ = 0.5, the birefringence can reach 0.551 × 10-2 at the normalized wavelength λ / Λ = 2.04μm, at the normalized wavelength λ / Λ = 0.93μm x The coupling length in the polarization direction is 145.32μm, and the coupling length in the y-polarization direction is 154.68μm.In this paper, the band is extended to the mid-infrared, and the dual-core photonic crystal fiber combining the coupling length and the high polarization maintaining property to the mid-infrared band fiber coupler Research is of great significance.