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提出一种新型的双折射光子晶体光纤,在正八边形的基础上改变纤芯附近的几个空气孔的直径产生双折射.利用多极法对该光纤基模的模场分布、色散、限制损耗及双折射特性进行数值分析,并且分析了一些参数对双折射的影响.计算了具有相同参数的六边形结构光子晶体光纤的色散系数、限制损耗及双折射率.研究表明,具有相同参数的八边形结构光子晶体光纤比六边形结构光子晶体光纤的双折射率明显提高,限制损耗大幅度减小,零色散波长也向短波方向移动.
A new type of birefringent photonic crystal fiber is proposed, which changes the diameter of several air holes in the vicinity of the core to produce birefringence on the basis of a regular octagon. By using the multipole method, the mode field distribution, dispersion and limitation of the fundamental mode of the fiber Loss and birefringence characteristics of the hexagonal photonic crystal fiber are analyzed numerically and the effects of some parameters on the birefringence are analyzed.The dispersion coefficient, limiting loss and birefringence of the hexagonal photonic crystal fiber with the same parameters are calculated.The results show that with the same parameters Of the octagonal structure photonic crystal fiber hexagonal photonic crystal fiber than the birefringence significantly improved the limit loss significantly reduced the zero-dispersion wavelength also to shortwave direction.