CAJ | 학술논문

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。
위료동시실현고쌍절사고비선성병득도저손모，설계일충재광섬섬심부근인입타원형공기공화원형공기공조성적신형우화적팔변형광자정체광섬。채용전시량유한원법결합각향이성완미필배층，대해광섬적유효면적、비선성、쌍절사화손모특성진행료모의분석。수치모의결과표명，통과선택괄당적결구삼수，재파장1.55μm처，해광섬구유고쌍절사고체B=1.68×10-2，비보통광섬고량개수량급，고비선성계수위γ=60 W-1km-1화저손위0.6 dB/km。저충구유고쌍절사고비선성계수적광섬가용우광통신、편진민감적각충설비화산생초련속보등영역。
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 1.68×10-2 at wavelength 1.55 μm, it is about two orders of magnitude higher than that of the regular polarization maintaining fiber. High nonlinearity γ=60 W-1km-1, and low confinement loss 0.6 dB/km at wavelength 1.55μm. This highly birefringence PCFs with high nonlinear coefficient have received growing attention in telecommunication, various polarization sensitive devices and supercontinuum applications systems.