中文摘要：

将数字信号处理技术和有限元方法相结合,提出了一种改进的快速评估实际光子晶体光纤特性的方法。针对光纤截面的数字图像中出现空气孔断裂的情况,应用数字化的方法自动检测断裂的空气孔边缘,并采用边缘生长方法自动连接断裂的空气孔,以重建用于光子晶体光纤分析的光纤截面信息。在此基础上,结合有限元方法实现了对实际光子晶体光纤特性的快速评估。结合已有的商用的光子晶体光纤对提出的改进方法进行了验证,结果表明：该方法可以有效、快速评估光子晶体光纤的特性,为一些复杂的难以测量光纤特性的评估提供了一种有效方法。

英文摘要：

Based on the combination model of digital image processing and finite element method,an improved method was proposed to rapidly evaluate the optical properties of actual Photonic Crystal Fibers（PCFs）.Due to the occurence of the fractured edges of some air holes in the digital microscope image of the cross section of PCFs,digital image processing methods were applied to automatically detect and connect the fractured edges of air holes so as to reconstruct the cross section for rebuilding the optical properties of the actual PCFs.Finally the finite element method was used to fast evaluate the optical properties of the actual PCFs.As an example,one of the commercial PCFs was chosen to validate the improved method.Numerical results illustrate that the improved method can evaluate the optical properties of the actual PCFs rapidly and accurately,and offer an effective way for evaluating the optical properties of some complex PCFs that is difficult to be measured from the common method.