基于光子晶体的光子局域特性,并利用液晶的电控双折射效应,设计了一种新型的多通道可调滤波器。采用传输矩阵法对该滤波器的光学传输特性进行了数值模拟,分析了透射谱与晶体结构参数的关系,讨论了大角度入射光子晶体时电控双折射效应对透射谱的影响。结果表明:当入射角为89°时会出现多个间距不等的高透射率的透射峰。随着各液晶层折射率的增加,缺陷模发生红移。当向光子晶体施加电压时,透射峰的位置发生蓝移,但透射峰峰值大体不变,从而验证了此滤波器的可调节性。该光子晶体滤波器结构简单,可调谐性好,在波分复用系统光源、光谱分析仪和信道监测中有一定的应用价值。 Based on the photon local properties of photonic crystals and using the electrically controlled birefringence effect of the liquid crystal, a novel multi-channel tunable filter is designed. The transmission characteristics of the filter were numerically simulated by transmission matrix method. The relationship between the transmission spectra and the crystal structure parameters was analyzed. The influence of the electronically controlled birefringence on the transmission spectra was also discussed. The results show that when the incident angle is 89 °, there will be a plurality of high transmittance transmission peaks with different pitches. With the increase of the refractive index of the liquid crystal layer, the defect mode redshift. When a voltage is applied to the photonic crystal, the position of the transmission peak is blue-shifted, but the peak of the transmission peak is substantially unchanged, thereby verifying the adjustability of the filter. The photonic crystal filter has the advantages of simple structure and good tunability, and has certain application value in the light source, spectrum analyzer and channel monitoring of the WDM system.