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应用多极法比较和分析了相同结构参数下的正六边形、正八边形和正十边形光子晶体光纤的色散系数、色散斜率、非线性系数和限制损耗.正六边形光子晶体光纤更适合用于色散补偿和高非线性的研究,在波长0.8μm处的非线性系数达到了0.37m-1·W-1;正十边形光子晶体光纤更适合用于色散平坦和低限制损耗的研究,在波长0.8μm处的限制损耗相对正六边形光子晶体光纤减小了约3000个数量级,在1.4—1.65μm波长范围内,正十边形光纤的色散系数介于-0.07—0.17ps/(km·nm)之间,得到1.55μm附近的近似零色散光子晶体光纤.包层结构越接近圆形的光子晶体光纤的限制损耗越低,非线性系数越低,色散越平坦.
The multi-pole method is used to compare and analyze the chromatic dispersion coefficient, dispersion slope, nonlinear coefficient and limiting loss of regular hexagonal, regular octagon and regular decagonal photonic crystal fiber under the same structural parameters.The regular hexagonal photonic crystal fiber is more suitable for use In the studies of dispersion compensation and high nonlinearity, the nonlinear coefficient at the wavelength of 0.8μm reaches 0.37m-1 · W-1. The regular decagonal photonic crystal fiber is more suitable for the study of dispersion flatness and low limit loss, The limiting loss at the wavelength of 0.8 μm is reduced by about 3000 orders of magnitude compared with the regular hexagonal photonic crystal fiber. The dispersion coefficient of the regular decagonal optical fiber in the wavelength range of 1.4-1.65 μm is between -0.07 and 0.17 ps / (km · Nm) to obtain approximately zero dispersion photonic crystal fiber near 1.55μm.The lower the limiting loss of the photonic crystal fiber with the cladding structure closer to the circle, the lower the nonlinear coefficient, the more flat the dispersion.