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提出了一种基于Michelson Gires-Tournois interferometer(MGTI)型不等带宽光交错复用器(interleaver)的新颖设计方法,可以简便地得到所有结构参数。通过z变换简化多镜GT腔(GTE)复杂的透射方向和反射方向光波电矢量的表达式,结合数字信号滤波器中椭圆滤波器的设计原理,利用极点值即可得到GT腔的腔长、臂长差和GT腔各镜面的反射率。给出了占空比为1:3的25 GHz不等带宽interleaver的设计实例,比较了采用不同GT腔结构的多组模拟仿真结果。分析了实现任意占空比interleaver的设计原理,给出了同一3阶结构情况下的4组不同占空比的设计实例,以及3组不同阶数下的占空比为1:4的该结构光交错滤波器的具体设计参数和结果。
A novel design method based on the Michelson Gires-Tournois interferometer (MGTI) unequal-bandwidth interleaver is proposed. All the structural parameters can be easily obtained. By simplifying the complex transmissivity and reflection direction electric wave vector of multi-mirror GT cavity (GTE) by z-transform, combined with the design principle of elliptic filter in digital signal filter, the cavity length of GT cavity can be obtained by using the pole value, Arm length difference and GT cavity reflectivity of the mirror. The design example of 25 GHz unequal bandwidth interleaver with 1: 3 duty ratio is given, and the results of multi-group simulation using different GT cavity structures are compared. The design principle of interleaver with arbitrary duty ratio is analyzed. The design examples of four different duty cycles with the same third order structure are given, and the structure with the duty ratio of 1: 4 under three different orders is given Optical interleaving filter specific design parameters and results.