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采用时域有限差分法对光子晶体光纤导模的传输特性进行数值分析 ,通过该法可得到任意横向结构光子晶体光纤的色散特性和双折射特性。为提高精度 ,在计算中应用了各向异性完全匹配层作为吸收边界条件。光子晶体光纤的传输特性完全由其横向结构决定。用时域有限差分法对一类对称结构和两类非对称结构光子晶体光纤进行了数值分析 ,计算结果表明经合理设计的非对称结构光子晶体光纤中可存在较高的双折射 (其双折射可达0 .0 7)。表明时域有限差分法可有效应用于分析和设计具有特定色散和偏振特性的光子晶体光纤。
The finite-difference time-domain method is used to numerically analyze the propagation characteristics of photonic crystal fiber guided modes. By this method, the dispersion characteristics and birefringence properties of photonic crystal fibers with any transverse structure can be obtained. To improve the accuracy, an anisotropic perfectly matched layer is used as the absorption boundary condition in the calculation. The transmission properties of photonic crystal fibers are completely determined by their lateral structure. A finite-difference time-domain method is used to analyze a class of symmetric structures and two types of asymmetric photonic crystal fibers. The calculated results show that the birefringence of the asymmetric structured photonic crystal fibers Up to 0.07). It is shown that FDTD can be effectively applied to the analysis and design of photonic crystal fibers with specific dispersion and polarization characteristics.