In order to analyze the dependence of the nonlinear coefficient and dispersion property on the structural parameters of the inner air hole size and the changing of the air hole fraction, by using the full vector finite element method, the nonlinear coefficient and dispersion property as a function of frequency and design parameters were investigated. According to the analysis results, the nonlinear coefficient of photonic crystal fiber with hexagonal structure is significantly increased and the dispersion is flat. It is shown from numerical results that it is possible to design photonic crystal fiber of hexagonal structure with single mode transmission during 400nm ~ 1160nm and high nonlinear coefficient achieves 172km-1 · W-1 , dispersion becomes flattened between 0. 65μm ~ 1. 0μm. This result is helpful to the research of optical communication.%为了研究最内层空气孔的大小以及空气孔的占空比改变对光子晶体光纤的非线性系数、色散的影响,采用全矢量有限元方法,进行了理论分析和实验验证,取得了非线性系数、色散系数随频率和结构参量的变化数据.结果表明,三角晶格结构的非线性系数大,色散较平坦,能够在400nm ～ 1160nm保持单模传输,非线性系数达到172km-1·W-1,在0.65 μm～1.0μm范围内具有超平坦色散.这一结果对光通信领域的研究是有帮助的.
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