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利用有限元方法对纤芯中心带有一个微小空气孔的光子晶体光纤进行了分析,得到了其模场分布、损耗及色散特性随光纤结构参数及波长的变化规律.根据光的衍射原理及光子晶体光纤的传输特性,对空气孔传光的物理本质进行了解释.得到了微小空气孔低损耗、高强度、单模传输时,光子晶体光纤结构参数及波长的取值范围.设计出了一种优化的光子晶体光纤结构,其模场很好地集中在纤芯微小空气孔中,限制损耗α=5.9×10~(-5)dB/km,为微小空气孔传光的光子晶体光纤设计及制备提供了理论指导.光在空气孔中高强度、长距离传输,为光与物质相互作用及非线性光纤光学提供了新的条件.
The photonic crystal fiber with a small air hole in the center of the fiber core was analyzed by using the finite element method and the variation of the mode field distribution, loss and dispersion characteristics with the fiber structure parameters and wavelength was obtained. According to the principle of diffraction of light and the photon Crystal fiber transmission characteristics of the physical nature of air-hole transmission was explained.With low-loss, high-intensity, single-mode transmission of tiny air holes, the photonic crystal fiber structure parameters and wavelength range of values.An optimized Of the photonic crystal fiber structure, the mode field is well concentrated in the small core air core hole, limiting loss α = 5.9 × 10 -5 dB / km, for the microscopic air hole photonic crystal fiber design and preparation provided Theoretical guidance. Light in the air hole in the high-intensity, long-distance transmission, for light and material interaction and nonlinear optical fiber provides a new condition.