中文摘要：

提出了一种复合结构的级联微环谐振腔光学游标滤波器．用信号流程图法分析了游标滤波器的工作原理，利用梅森公式给出了输出功率表达式，随后探讨了器件输出谱的谐振条件、对比度和精细度．数值模拟结果表明：级联微环谐振腔光学游标滤波器相对于单个微环谐振腔而言，自由谱宽范围、对比度和精细度均得到了显著提高，并为该器件更好地应用到波分复用系统中的光滤波器、色散补偿器、光开关等器件中提供了理论依据．

英文摘要：

A simple optical vernier filter with cascaded micro-ring resonators is proposed. Using the signal flow graph method, the mechanism of the device is analyzed in detail. Meanwhile, analytic expressions of transmission function and its finesse, contrast are derived with the mason formula. Simulation results show that the contrast, finesse and the free spectral range of the proposed vernier filter can be increased remarkably com- pared with the individual one mico-ring resonator. These results provide the theoretical basis for the proposed vernier filter is better used to filter, dispersion compensator and optical switch in wavelength division multiple system.