中文摘要：

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.

英文摘要：

A kind of chalcogenide glass midinfrared dual-core photonic crystal fiber has been proposed in this paper. The coupling characteristic of this fiber has been studied by multipole method using the basic theory of coupling. It is found that the birefringence of dual-core PCF with pitch 5. 4 μm,air-hole radius 1. 35 μm and air-filling fraction 0. 5 is 0. 551 × 10-2 at normalized frequency λ /Λ = 2. 04 μm. At normalized frequency λ /Λ = 0. 93 μm,coupling lengths are 145. 32 μm and 154. 68 μm for x-polarized mode and y-polarized mode,respectively. The band extended to midinfrared. This dual-core photonic crystal fiber with coupling length and high polarization is useful for manufacturing midinfrared band optical fiber coupler.