高双折射高非线性低损耗八边形光子晶体光纤特性

为了同时实现高双折射高非线性并得到低损耗，设计一种在光纤纤芯附近引入椭圆形空气孔和圆形空气孔组成的新型优化的八边形光子晶体光纤。采用全矢量有限元法结合各向异性完美匹配层，对该光纤的有效面积、非线性、双折射和损耗特性进行了模拟分析。数值模拟结果表明，通过选择适当的结构参数，在波长1.55 m处，该光纤具有高双折射高达B=1.6810-2，比普通光纤高两个数量级，高非线性系数为=60 W-1km-1和低损为0.6 dB/km。这种具有高双折射高非线性系数的光纤可用于光通信、偏振敏感的各种设备和产生超连续普等领域。

High birefringence and high nonlinear octagonal photonic crystal fiber with low confinement loss

A novel octagonal photonic crystal fiber (PCF) was designed using an elliptical air hole and large circular air hole in the core region in order to enhance the performance of modal nonlinearity, birefringence and to get the low confinement loss at the same time. Its effective mode area, nonlinearity, birefringence and confinement loss were investigated simultaneously by using finite element method(FEM) with anisotropic perfectly matched layers. The numerical simulation results show that by choosing suitable relative structure parameters that the proposed fiber has high birefringence up to the order of 1.6810-2 at wavelength 1.55 m, it is about two orders of magnitude higher than that of the regular polarization maintaining fiber. High nonlinearity =60 W-1km-1, and low confinement loss 0.6 dB/km at wavelength 1.55 m. This highly birefringence PCFs with high nonlinear coefficient have received growing attention in telecommunication, various polarization sensitive devices and supercontinuum applications systems.