为了获得超平坦色散特性,且有较大的模场面积和较小的限制损耗,从麦克斯韦方程组出发,采用有限元法,在考虑到纯石英材料自身色散的前提下,进行了相应的理论分析,计算得到了光子晶体光纤的模场分布、基模有效折射率和色散系数等参量关系,可知光纤色散值的变化在±1.0ps·km-1 ·nm -1以内,模场面积都大于40μm2,限制损耗小于0.2dB/km.结果表明,调节空气孔直径和包层空气孔间距的大小,改变介质的填充比,可以有效地控制光子晶体光纤的色散与模场面积.%In order to obtain ultra-smooth dispersion characteristics, a large mode area and a smaller limitation loss, starting from the Maxwell equations, taking into account the dispersion of pure quartz themselves, the mode field distribution of the photonic crystal fibers, effective index of fundamental modes and dispersion coefficient were calculated with the finite element method. With the fiber dispersion within ± 1.0ps·km-1 ? Nm-1, the mode area was larger than 40μm2, and the confinement loss was less than 0.2dB/km. The results show that the dispersion and mode field area of photonic crystal fibers can be controlled by adjusting the air hole diameter, the pitch size of the cladding air holes, and the media filling ratio.
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