摘要
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 propagation characteristics of the photonic crystal fibers (PCF) are numerically analyzed using the finite-difference time-domain (FDTD) method. The dispersion characteristics and the birefringent properties of PCF with any given transversal structure can be obtained by the FDTD method. To improve numerical precision, the anisotropic perfectly matched layer (APML) is used as an absorbing boundary condition in computing. The propagation characteristics of PCF are wholly determined by its transversal structure. One type of PCF with symmetric air-silica structure and two types of PCF with asymmetric air-silica structure are analyzed numerically. Numerical results show that it may exhibit high birefringence in a properly designed asymmetric PCF (whose birefringence can be as high as 0.07). It is shown that the FDTD method can be effectively used in the analysis and design of the PCF with special dispersion and polarization characteristics.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2004年第11期1552-1556,共5页
Acta Optica Sinica
