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对于非均匀孔径光子晶体光纤(PCF)模式截止特性的分析,基于基空间填充模(FSM)的方法不再适用。使用全矢量超格子模型给出了光子晶体光纤模场半径的计算方法,并提出通过分析各模式模场半径的突变现象可以判断模式截止,使用该方法对双孔保偏光子晶体光纤和最内层为小孔的光子晶体光纤模式截止特性作了分析和讨论,结果表明,通过该方法能准确地判断非均匀孔径光子晶体光纤中的模式截止,只要波长扫描的精度足够高就能精确地求解出各个模式的截止波长。
For the analysis of the cutoff characteristics of non-uniform aperture photonic crystal fiber (PCF) mode, the method based on the basic space fill mode (FSM) is no longer applicable. The method of calculating the mode field radius of photonic crystal fiber is given by using a full vector super lattice model. It is proposed that the mode cutoff can be judged by analyzing the abrupt change of the mode field radius of each mode. The results show that this method can accurately determine the mode cut-off in non-uniform aperture photonic crystal fiber, as long as the wavelength scanning accuracy is high enough to accurately solve The cut-off wavelength of each mode.