将微环谐振腔应用于普通马赫-曾德尔干涉仪滤波器中, 构成一种新型滤波器, 用信号流程图法推导了其输出端传递函数, 并对其输出结果进行了模拟. 结果表明: 该滤波器能输出透过率近似平顶和平底的矩形方波, 自由光谱范围达111 GHz, 消光比达10.2 dB. 和普通的马赫-曾德尔干涉仪滤波器相比, 自由光谱范围、消光比、精细度都显著提高.改变微环谐振腔和马赫-曾德尔干涉仪滤波器的组合方式, 得到更多的输出波形. 讨论了各项参量对器件输出性能的影响.

The single microring resonator was applied to ordinary Mach-Zehnder interferometer filter constituting a new type filter. The output transfer function was derived by the signal flow graph method, and the output spectra were simulated and analyzed. The results show that the improved filter can give rectangular waves approximating flat top and flat bottom, The free spectral range up to 111 GHz, the extinction ratio of 10.2dB. Compared with Mach-Zehnder interferometer filter, free spectral range, the extinction ratio, precision are improved obviously. By changing the way of combination of micro ring resonator and Mach-Zehnder interferometer filter, more output waveforms were got. The effects of various parameters on the output performance of the device was discussed.