论文部分内容阅读
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1.55μm处,该光纤具有高双折射高达B=1.68×10-2,比普通光纤高两个数量级,高非线性系数为γ=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。
In order to achieve high nonlinearity with high birefringence and low loss, a novel optimized octagonal photonic crystal fiber with an elliptical air hole and a circular air hole near the fiber core is designed. The full-vector finite element method and anisotropic perfect matching layer were used to simulate the effective area, nonlinearity, birefringence and loss characteristics of the fiber. The numerical simulation results show that the fiber has a high birefringence as high as B = 1.68 × 10-2 at 1.55μm wavelength by selecting the appropriate structural parameters, which is two orders of magnitude higher than that of ordinary fiber and the high nonlinear coefficient is γ = 60 W -1km-1 and a low loss of 0.6 dB / km. This type of fiber with high birefringence and high nonlinearity can be used in the field of optical communications, polarization-sensitive devices and supercontinuum generation.