由光子晶体光纤的对称性可以得到模式分布的对称性,根据模式的对称性选择适当的展开函数,可以使计算量大大减少。计算了六角结构光子晶体光纤的色散特性,得到了波长在1.55 μm处色散为零时,光子晶体光纤的结构参量所满足的方程。

The mode symmetry can be obtained according to the symmetry of photonic crystal fiber. Optical field can be developed by using fundamental function with the same symmetry, the calculation will be simplified by using suitable spread function with same symmetry. The dispersion of hexagonal photonic crystal fiber is studied, and the fit polynomial functions are derived by which the parameter of structure can meet and the dispersion can be zero at 1.55 μm wavelength.