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微环谐振器具有结构紧凑、易于大规模集成等优点,在研究中多采用多环联接来改进其滤波特性。提出了一种改进型的N阶微环矩阵谐振滤波器结构,使N阶矩阵为菱形排列方式,以获得更佳的旁瓣、带内纹波等性能指标。以3阶微环矩阵为例,利用耦合模理论对N阶微环矩阵建立稳态方程,求解出3阶微环矩阵的输出特性,并与其他同环数的微环阵列在滤波性能上进行比较分析,得出结论:在相应结构参数和微环数目相同的情况下,改进型N阶微环矩阵谐振滤波器在通带宽度、远端抑制、旁瓣等方面较多环联接方式更具优势。该改进型N阶微环矩阵谐振滤波器可以在宽信道大容量的波分复用系统中得到应用。
Micro-ring resonators have the advantages of compact structure and easy integration in large scale. Multi-loop coupling is often used in the research to improve their filtering characteristics. An improved N-th order micro-ring matrix resonant filter structure is proposed. The N-th order matrix is a rhombic arrangement, so as to obtain better performance of side lobe and in-band ripple. Taking the third-order micro-ring matrix as an example, the steady-state equations of the N-th order micro-ring matrix are established by the coupled-mode theory. The output characteristics of the third-order micro-ring matrix are solved and the performance of the third-order micro- By comparison and analysis, it is concluded that the modified N-th order micro-ring matrix resonant filter has more loop connection modes in terms of passband width, far-end suppression and side lobe, etc., with the same structural parameters and the same number of micro- Advantage. The improved N-th order micro-ring matrix resonant filter can be used in wide-channel WDM systems.