基于双微环结构的MZI型波长交错滤波器

为了改善全光纤马赫-曾德尔干涉仪(Mach-Zehnder interferometer,MZI)的传输特性,提出了一种基于双微环辅助型的MZI交叉复用器。根据其结构,利用信号流图推导出了该器件的输出表达式,并进行了数值模拟分析,得到了传输过程中的最佳结构参数。此外,还分析了耦合器耦合系数及传输损耗对该器件的影响。结果表明,改进后的MZI交叉复用器输出谱线更加接近方波,其25 dB截止带带宽和0.5 dB通透带带宽明显改善,其值分别为41.2 GHz和18.9 GHz。器件具有一定的抗偏差能力且传输损耗对滤波器消光特性的影响较小。

MZI wavelength interleaving filter based on double microring structure

To improve the output characteristics of all-fiber Mach-Zehnder interferometer (MZI)-interleaver,a dual microring-assisted MZI interleaver is designed.According to its structure,the output expression of the device is derived from the signal flow diagram.After simulation analysis,the optimal structural parameters during the transmission process are obtained.In addition,the coupling coefficient and transmission loss of the coupler are analyzed.The results show that the improved interleaver output line wave is closer to the square wave,and its 25 dB cutoff band bandwidth and 0.5 dB passband bandwidth are significantly improved,with the values of 41.2 GHz and 18.9 GHz,respectively.The device has a certain resistantability to deviation,and the transmission loss has less influence on the extinction characteristics of the filter.