正方形空气孔光子晶体光纤特性分析

摘要

In order to obtain photonic crystal fiber with high birefringence and flattened dispersion, we propose a new photonic crystal fiber structure with an elliptical air hole as the core surrounded by square air holes. In this paper, the effects of different fiber core ellipticity and different filled material on birefringence, dispersion and nonlinearity of photonic crystal fiber are discussed. The results show that at the wavelength of 1.55 μm, when the core ellipticity of the filled material is the same, the maximum birefringence value is 0.37 and the maximum value of nonlinear system is 277.76 W-1·km-1. When the fiber is filled with different materials, the maximum birefringence value is 0.34 and maximum nonlinear value is 307 W-1·km-1. In addition, in the wavelength range of 1.26 μm~1.8 μm, the nearly ze-rodispersion flattened characteristics are achieved. The range of variations is no more than ±12.5 ps/(nm·km), and the bandwidth is 0.6 μm.%为了同时获得高双折射和色散平坦特性的光子晶体光纤,本文提出了一种包层以椭圆空气孔为纤芯,四周环绕正方形空气孔的光子晶体光纤结构.基于不同纤芯椭圆率、不同纤芯填充村料,对所提光子晶体光纤结构的双折射、色散、非线性等性能进行了讨论.结果表明,在波长1.55 μm处,当纤芯椭圆率不同,填充村料相同时,最大双折射值为0.37,最大非线性系数值277.76 W-1·km-1;当纤芯填充村料不同,椭圆率相同时,最大双折射值为0.34,最大非线性系数值为307 W-1·km-1.在波段1.26 μm~1.8 μm范围,色散呈现出近零色散平坦特性,变化范围不超过±12.5 ps/(nm·km),带宽0.6 μm.