一种新型不等带宽波长交错滤波器的设计

Design of a New Type Different Bandwidth Interleaver

为改善常规马赫-曾德尔干涉仪型波长交错滤波器的输出特性,提出了一种将光纤环型腔加入非平衡马赫-曾德尔干涉仪的干涉臂中构成的新型波长交错滤波器,运用光纤传输理论和矩阵理论,得到该器件的输出表达式。通过数值模拟分析了光纤环型腔的耦合比和光纤臂长差对该波长交错滤波器性能的影响。结果表明:组成滤波器干涉臂的两对臂长差相等时,光纤环型腔的耦合比取一些定值可得到平坦的输出光谱,该器件在3dB处,奇信道带宽大于15GHz用于10Gb/s的传输,偶信道带宽大于60GHz用于40Gb/s的传输。这种滤波器在10Gb/s向10Gb/s+40Gb/s升级过程中作为复用-解复用器具有很大优势。

In order to improve the transmission performance of the conventional Mach-Zehnder interferometer,a novel interleaver based on nonsymmetrical Mach-Zehnder interferometer with adding optical fiber ring resonator to interference arm was presented.The output expression was established and described by using the principle of fiber transmission and the matrix transfer function.Through numerical simulation,the influence of the coupling ratios of the optical fiber ring resonator and the length difference of interference arms on the different bandwidth interleaver was analyzed.The analytical results indicate when the length of interference arms is equal,the port output curves are quite ideal by taking some certain values for the coupling ratios of the optical fiber ring resonator.Between 3 dB points,odd channels have more than 15 GHz passband for 10 Gb/s and the other even channels have more than 60 GHz passband for 40 Gb/s.This kind of interleaver has more advantages as multiplexer/demultiplexer during upgrade from 10 Gb/s to 10 Gb/s plus 40 Gb/s.