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设计了一种新型矩形点阵光子晶体光纤,该光纤纤芯缺失一根空气柱,包层沿光纤长度方向在普通矩形点阵光子晶体光纤中每两列之间隔一行插入一列空气孔而形成正方形网孔结构.采用全矢量有限元法并结合各向异性完美匹配边界条件,对该光纤的色散、双折射和约束损耗进行了数值模拟.结果发现,该光纤具有高双折射负色散效应和较强的模约束能力,约束损耗小于10-2dB·m-1,通过改变光纤结构参数(即空气孔间隔Λ和相对孔间隔d/Λ),可以调节该光纤高双折射负色散工作波长.若调整光纤结构参数Λ=2.0μm,d/Λ=0.4,该光纤在C波段(1.53—1.565μm)呈现负色散并具有负色散斜率,双折射高达10-2,非线性系数接近55km-1W-1.该光纤将在保偏光通信、色散补偿以及基于四波混频的波长转换器设计等方面具有重要的应用.
A new type of rectangular lattice photonic crystal fiber is designed. The fiber core lacks an air column. The cladding layer is inserted into an array of air holes at intervals of two columns in an ordinary rectangular lattice photonic crystal fiber along the length of the optical fiber to form a square Mesh structure.The dispersion, birefringence and confinement loss of the fiber were numerically simulated by the full vector finite element method combined with the perfect anisotropic matching boundary conditions.The results show that the fiber has high birefringence negative dispersion effect Strong mode constraint ability, the constraint loss is less than 10-2dB · m-1, by changing the fiber structure parameters (air hole spacing Λ and relative hole spacing d / Λ), you can adjust the fiber high birefringence negative dispersion wavelength. The optical fiber structure parameters Λ = 2.0μm, d / Λ = 0.4, the optical fiber in the C band (1.53-1.565μm) showed negative dispersion and negative dispersion slope, birefringence up to 10-2, the nonlinear coefficient close to 55km-1W- 1. The fiber will have important applications in polarization maintaining communications, dispersion compensation, and wavelength converter design based on four-wave mixing.