为了得到高非线性低损耗光子晶体光纤,设计了八角格子圆形空气孔组成的光子晶体光纤结构。利用全矢量有限元法并结合完美匹配层吸收边界条件,对该光子晶体光纤的纤芯材料折射率、非线性系数和限制损耗进行了数值模拟。数值模拟结果表明,该光纤呈现高非线性、低损耗和较好的模场约束能力。调整光纤参数为d1=0.77μm,d2=0.86μm时可以得到更好的结果,在波长1.55μm处获得高的非线性系数37.6km-1.W-1和低限制损耗0.7×10-17dB/km。 In order to obtain a high nonlinear low loss photonic crystal fiber, an octagonal lattice circular air hole photonic crystal fiber structure is designed. The refractive index, nonlinear coefficient and limiting loss of the core material of the photonic crystal fiber are numerically simulated by the full vector finite element method and the perfect matching layer absorption boundary condition. The numerical simulation results show that the optical fiber exhibits high nonlinearity, low loss and good mode field constrain. Better tuning results were obtained with d1 = 0.77μm and d2 = 0.86μm with a high non-linear coefficient of 37.6km-1.W-1 at a wavelength of 1.55μm and a low limit loss of 0.7 × 10-17dB / km.