在微环与波导构成的耦合光学器件中,布拉格谐振对下载端频谱的带宽、形状因子损害非常大.提出了消除布拉格谐振的方法,并对改进后的谐振带影响因素进行仿真.通过分析微环谐振条件和布拉格谐振条件,利用Matlab传输矩阵法仿真了并联微环的下载端函数模型,仿真得到输出频谱.结果表明,当微环间距与微环周长的比值为0.25,输出频谱的布拉格谐振带(BB)消失,出现了单个微环谐振带.上述方法消除了布拉格谐振带对频谱的损害,使频谱形状因子显著提高,设计的DWDM的信道密集度与系统折射率差成反比.%In the coupling optics of microring and waveguide,the Bragg resonances greatly damage the bandwidth and shape factor of the spectrum at the drop port.A method for eliminating Bragg resonance was put forward,and the influence factors of the modified resonance band were simulated.By analyzing the microring resonance condition and Bragg resonance condition,the mathematic model of the drop port of the parallel microring was simulated with Matlab transfer matrix method,and the output spectrum was simulated.The results show that the Bragg resonant band (BB) of the output spectrum disappears when the ratio of the microring spacing to the perimeter of the microring is 0.25.This method eliminates the spectral damage of the Bragg resonant band and improves the spectral shape factor significantly.The channel density of the designed DWDM is inversely proportional to the refractive index difference of the system.
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