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应用多极法,研究了正六边形结构光子晶体光纤的结构参数改变时,波长范围在0.8—1.8μm之间的双零色散光子晶体光纤的色散特性和非线系数随波长的变化规律.对具有相同结构参数的正六边形结构和正八边形结构进行比较,得到正六边形结构的双零色散光子晶体光纤的色散更加平坦,非线性系数有明显增大的结果.因此,正六边形结构更容易获得色散平坦的高非线性双零色散光子晶体光纤.最终设计了在800nm附近具有平坦色散和高非线性的正六边形双零色散光子晶体光纤.
The multi-pole method was used to study the dispersion characteristics and nonlinear coefficient of two-zero dispersion photonic crystal fiber with wavelength in the range of 0.8-1.8μm when the structural parameters of the hexagonal structured photonic crystal fiber changed. Comparing the regular hexagons and the regular octagon with the same structural parameters, the dispersion of the double-zero-dispersion photonic crystal fiber with a regular hexagonal structure is smoother and the nonlinear coefficient is obviously increased. Therefore, the regular hexagonal structure It is easier to obtain a highly nonlinear double zero dispersion photonic crystal fiber with flattened dispersion.The final design is a regular hexagonal double zero dispersion photonic crystal fiber with flat dispersion and high nonlinearity near 800nm.