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基于两点耦合和光波干涉控制相移思想提出U型波导耦合单微环的谐振滤波器结构。利用传输矩阵法推导了此结构的数学模型,采用Matlab模拟了输出端口谱线形状。当微环与U型波导的两个耦合点之间的距离为微环周长的整数倍时,此新型微环谐振滤波器比传统的双直波导耦合单微环滤波器的自由光谱范围增加1倍。针对该结构参数,同时讨论了耦合系数对输出谱线的影响,得出当耦合系数为0.018时,输出谱线具有最佳的消光比,同时保持窄的带宽和高的品质因子。
Based on the idea of two-point coupling and phase-shift control of lightwave interference, a U-waveguide coupled single-loop resonant filter structure is proposed. The mathematical model of this structure was deduced by using the transfer matrix method and the spectral shape of the output port was simulated by Matlab. When the distance between the two coupling points of the microring and the U-shaped waveguide is an integral multiple of the microring circumference, the new microring resonator filter has a higher free spectral range than that of the conventional dual-waveguide coupled single-loop filter 1 times. According to the structural parameters, the influence of the coupling coefficient on the output spectrum is also discussed. It is found that the output spectrum has the best extinction ratio when the coupling coefficient is 0.018, while keeping the narrow bandwidth and the high quality factor.