为了研究正方形栅格全固态光子晶体光纤色散特性,基于全矢量有限元法,对其色散特性进行了数值模拟.通过改变正方形栅格全固态光子晶体光纤的结构参量,分析比较了它们的色散特点,并通过改进结构得出一种零散波长在1.55 μm的四方栅格全固态光子带隙光纤.结果表明,四方栅格全固态光子带隙光纤色散具有3个零色散点,其零色散波长随高折射率棒直径d的增大而向长波方向移动,其色散平坦程度随棒间距Λ的减少而变得更加平坦.这为全固态光子晶体光纤的设计和制作提供了理论依据.%In order to study the dispersion characteristics of square-lattice all solid photonic bandgap fibers, the dispersion characteristics were simulated by means of full-vector finite element method. After changing the structure parameters of a square-lattice all solid photonic bandgap fiber, its dispersion characteristics were analyzed. Finally, an all solid photonic bandgap fiber with zero dispersion wavelength at 1. 55μm was proposed. The analytical results demonstrate that an all solid square-lattice photonic bandgap fiber has three zero wavelengths, the dispersion characteristic curves shift to the longer wavelength as the hole diameter d becomes larger and the dispersion slope becomes more flattened with the decrease of the hole pitch A. It provides a theoretical evidence to design and fabricate all solid photonic bandgap fibers.
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