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利用全矢量有限元法分析了光子晶体光纤(PCF)的结构参量对其本征模场分布的影响。数值计算结果表明,具有多层空气孔、多层纤芯、大孔间距和大占空比的结构更有利于将光场约束在纤芯中,纤芯层数、孔间距和占空比的增加均会导致PCF本征模场出现更高阶次的模式。纤芯层数和孔间距的增加会对由占空比减小所引起的功率泄漏进行一定的补偿,通过减小空气占空比、增加纤芯层数和孔间距,可实现大模场单模传输的可行性。对于4层空气孔、2层纤芯、占空比为0.01、孔间距为20μm的PCF,在保证单模传输的条件下,纤芯半径可达40μm,有效模面积为3717μm2,纤芯功率集中度为68.32%。
The full-vector finite element method is used to analyze the influence of structural parameters of photonic crystal fiber (PCF) on its mode field distribution. The numerical results show that the structure with multi-layer air holes, multi-layer core, large hole spacing and large duty ratio is more conducive to confine the light field in the core, the number of core layers, the hole spacing and the duty ratio The increase will lead to a higher order mode of PCF EMF. The increase of the number of core layers and the pitch of the holes will compensate for the power leakage caused by the decrease of the duty ratio. By reducing the air duty cycle and increasing the number of core layers and the pitch of holes, the large mode field single Feasibility of mode transmission. For 4 layers of air holes, 2 layers of core, a duty ratio of 0.01 and a hole spacing of 20μm, under the condition of single mode transmission, the core radius can reach 40μm and the effective mode area is 3717μm2. The core power is concentrated The degree is 68.32%.