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提出直接由MATLAB读入光纤端面图实现复杂结构光子晶体光纤(PCF)模型的快速建立,并综合平面波法(PWM)和频域有限差分(FDFD)法,模拟分析带隙型光子晶体光纤(PBG-PCF)的带隙和模场分布.利用PWM计算得到了在PBG-PCF中传输的光波频率及模式有效折射率范围;基于FDFD法在给定波长及模式有效折射率范围情况下,模拟得到了PBG-PCF中可能存在的模场分布及其他特性.以市售的PBG-PCF为例,验证了数值模拟的正确性,随后系统地分析了结构参数(晶格结构、“原子”占有率、背景材料折射率及“原子”折射率)对光子带隙的影响.这种分析方法及相应分析结果对大带隙PCF的设计和制备研究具有一定的参考价值.
It is proposed that the PCF model can be quickly established by reading the fiber end-view graph directly from MATLAB. By combining the method of plane wave method (FDDDD) and frequency-domain finite difference method (FDFD), the bandgap photonic crystal fiber (PBG -PCF) band gap and mode field distribution.The frequency of light wave and mode effective refractive index transmitted in PBG-PCF were calculated by PWM. Based on the FDFD method, given the wavelength and mode effective refractive index range, The possible field distribution and other properties of PBG-PCF are obtained.According to the commercially available PBG-PCF, the correctness of the numerical simulation is verified, and then the structural parameters (lattice structure, “atom” Possession rate, refractive index of the background material and refractive index of the “atom”) on the photonic bandgap. This analysis method and the corresponding analysis results have certain reference value for the design and fabrication of large bandgap PCF.