设计了一种具有高隔离度的八通道光子晶体滤波器,并应用时域有限差分法分析计算了在晶格常数相同的条件下,点缺陷微腔局域频率与光子晶体介质柱半径之间的变化规律。在此基础上,对该八通道滤波器的传输特性进行了仿真。结果表明,晶格常数取540nm时,该滤波器各信道的中心频率在1 510～1 580nm,信道间隔小于9.5nm,信道间隔离度均大于35dB。 An octa-channel photonic crystal filter with high isolation is designed. The time-domain finite difference method is used to analyze and calculate the relationship between the local frequency of the point-defect microcavity and the radius of the photonic crystal column under the same lattice constant. The law of change. On this basis, the transmission characteristics of the eight-channel filter are simulated. The results show that when the lattice constant is taken as 540 nm, the center frequency of each channel of the filter is in the range of 1 510 ~ 1 580 nm, the channel spacing is less than 9.5 nm, and the channel isolation is greater than 35 dB.