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为提高MZI(马赫-曾徳干涉仪)型交错滤波器的输出光平坦度,扩大信道带宽,提出了由1个3×3和两个2×2单模光纤耦合器组成的全光纤级联MZI型交错滤波器,用传输矩阵法推导出了模型的输出谱和相关参数之间的表达式并进行了特性分析。结果表明:当耦合器的分光比和光纤干涉臂之差为定值时,可以产生理想的交错谱图。这种滤波器信道间隔为2nm。此外应用双环光纤辅助的方法可使得输出波形的顶端更加平坦,边模抑制比贴近理论值。
In order to increase output flatness and increase channel bandwidth of MZI (Mach-Zehnder Interferometer) interleaved filter, an all-fiber cascade composed of one 3 × 3 and two 2 × 2 single mode fiber couplers MZI-type interleaved filter, the transfer matrix method is used to derive the expression between the output spectrum of the model and the related parameters and analyze the characteristics. The results show that when the difference between the splitting ratio of the coupler and the fiber interfering arm is a fixed value, an ideal staggered spectrum can be produced. This filter channel spacing is 2nm. In addition, the application of dual-loop fiber-assisted approach can make the top of the output waveform more flat, side mode suppression ratio close to the theoretical value.