基于图像处理的频域有限差分法用于实际光子晶体光纤的研究  

Analysis of Real Photonic Crystal Fibers by Finite-Difference Frequency-Domain Method Combined with Digital Image Processing

作　　者：姚宇宏[1] 栗岩锋[1] 刘博文[1] 胡明列[1] 柴路[1] 王清月[1] 童维军[2] 罗杰[2] 

机构地区：[1]天津大学精密仪器与光电子工程学院超快激光研究室,光电信息技术科学教育部重点实验室,天津300072 [2]长飞光纤光缆有限公司研发中心,湖北武汉430073

出　　处：《光学学报》2008年第7期1384-1389,共6页Acta Optica Sinica

基　　金：国家973计划(2003CB314904,2006CB806002);国家863计划(2007AA03Z447);国家自然科学基金(60678012)资助课题

摘　　要：提出了一种基于图像处理算法和频域有限差分法相结合研究实际光子晶体光纤的数值分析方法。该方法针对实际光子晶体光纤由于结构不规则难以进行数值分析的缺点,采取首先对光子晶体光纤的电镜扫描图像使用阈值分割和维纳滤波等图像处理算法获得光纤截面的几何图像,然后使用图像插值及构造均值移动窗口滤波等方法实现了网格划分和介电系数平均等步骤,最后结合频域有限差分法对光纤特性进行分析计算。结果表明,该方法能够精确分析实际光子晶体光纤的色散特性,模拟得到的实际光子晶体光纤的模场分布与实验结果吻合很好。A finite-difference frequency-domain method combined with digital image processing is used to analyze real photonic crystal fibers. To overcome the difficulties imposed by the irregularity of the fiber cross section, the fiber structure is first obtained from the scanning electron microscopy （SEM） image of a real photonic crystal fiber by such digital image processing techniques as thresholding segmentation and Wiener filtering. Image interpolation and window filtering method are then employed to realize mesh division and permittivity averaging. Parameters obtained above are used in fiber property analysis by the finite-difference frequency-domain method. It is shown that the proposed method gets accurate fiber dispersion compared with measurement, and also that the calculated mode field distributions correspond well with those recorded in the experiment.

关 键 词：导波光学 光子晶体光纤 频域有限差分法 数值分析 数字图像处理 

分 类 号：TN252[电子电信—物理电子学]