菱形纤芯光子晶体光纤色散与双折射特性分析

Dispersion and birefringence analysis of photonic crystal fiber with rhombus air-core structure

针对光子晶体光纤多零色散点、高双折射的应用要求,设计了一种新型结构的光子晶体光纤,其纤芯由位于菱形四个角上的圆形空气孔组成.通过有限元数值分析方法对该种结构光子晶体光纤的色散特性和双折射特性进行数值仿真,得到色散与波长、色散与纤芯圆孔尺寸、双折射与波长、双折射与纤芯圆孔尺寸的关系.研究结果表明:在满足光纤传输功率要求的条件下,光纤的双折射在d_1<0.8μm时的性能较好.同时,该种结构的光子晶体光纤在芯区直径满足d_1=0.4μm或d_1=0.6μm时会出现两个零色散点,这对进一步研制具有多零色散点的光子晶体光纤具有重要的意义.

Aiming at the requirements for multi-zero dispersion points and high birefringence of photonic crystal fibers,a new kind of photonic crystal fiber with rhombus air-core structure is composed of four air holes locate at four points of rhombus is proposed.By using the numerical analysis method based on the finite element,we simulate the dispersion and the birefringence characteristics of photonic crystal fiber,and obtain the relationships between dispersion and wavelength,dispersion and size of structure,birefringence and wavelength, birefringence and size of structure.Simulation results show that better birefringence can be obtained when the requirement of power is met.In addition,two zero dispersion points can be obtained when diameter d_1 is 0.4μm or 0.6μm.The results are of significance for the further development of photonic crystal fiber with multi-zero dispersion points.