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中文摘要：
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.
英文摘要：
Abstract The multi-pole method is used to analyse and compare the dispersion coefficient,dispersion slope,nonlinear coefficient,confinement loss of photonic crystal fibers of hexagonal,octagonal and decagonal structures with the same structure parameters.The photonic crystal fiber with hexagonal structure is more suited for study of dispersion compensation and high nonlinearity.The nonlinear coefficient of photonic crystal fiber with hexagonal structure is 0.37 m-1·W-1 at 0.8 μm.The photonic crystal fiber with decagonal structure is more suited for study of flat dispersion curve and low confinement loss.The confinement loss of photonic crystal fiber with decagonal structure is about 3000 orders of magnitude less than that with hexagonal structure around 0.8 μm.The dispersion of photonic crystal fibre with decagonal structure is less than 0.17 and larger than-0.07 ps/（km·nm） from 1.4 to 1.65 μm,resulting in nearly zero dispersion of photonic crystal fiber around 1.55 μm.The cladding structure of photonic crystal fiber is closer to the circular structure,the dispersion of which is much flatter,the nonlinear coefficient and the confinement loss of which are much lower.
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