基于一维光子晶体理论,提出了一种级联薄膜玻璃腔结构的平顶偏振滤波器。给出了具体的设计实例,透射窗口处P偏振光的透射率的最小值大于99.6%,S偏振光的透射率最大在0.1%左右,且P偏振光的各透射窗口的中心频率符合国际电信联盟(ITU)标准。在此基础上,系统研究了该结构各介质膜层参数(包括固体介质腔)以及入射角对透射谱性能,如矩形度、占空比和频率间隔等的影响。该滤波器不但结构简单,易于实现,且在高透射P偏振光的同时能很好地截止S偏振光,在波分复用系统中有一定的应用价值。 Based on the one-dimensional photonic crystal theory, a flat-topped polarization filter with cascaded thin film glass cavity structure is proposed. The specific design example is given. The minimum transmittance of P-polarized light in the transmission window is more than 99.6% and the maximum transmittance of S-polarized light is about 0.1%. The center frequencies of P-polarized transmission windows conform to International Telecommunications Union (ITU) standard. On this basis, the influence of parameters (including solid medium) and incident angle on the transmission spectrum properties, such as the squareness, duty cycle and frequency interval of the dielectric layers of the structure were studied systematically. The filter not only has the advantages of simple structure and easy implementation, but also can cut off S-polarized light well while transmitting P-polarized light in a high speed, and has certain application value in the WDM system.