随着密集波分复用(DWDM)技术的不断发展,光学梳状滤波器(Interleaver)从原始功能的两路输出谱带宽相等的等带宽器件向不等带宽器件发展,以灵活应用于复杂网络的分插复用及不同网络平台间的过渡等。迈克耳孙Gires-Tournois干涉仪(MGTI)型interleaver具有结构紧凑、成本低、参数简单易调节、性能优异等特点,是实现interleaver的一个典型方案。从严格的数学角度推导了判定MGTI型interleaver周期的理论依据,并给出了几个具体的MGTI结构周期的判定实例。任何参数结构的MGTI型interleaver,当GT腔镜面反射率发生变化时,等带宽与不等带宽MGTI型interleaver的奇、偶两路输出光谱光强相交点处的特性不同。具体给出了该不同特性的实例。这些结论可用来指导设计满足不同周期和带宽要求的MGTI型interleaver,对设计特种光学干涉滤波器也可起到一定的指导性作用。

With the development of the dense wavelength division multiplexer (DWDM) technique, asymmetrical interleaver is emerged. It can be used in optical add-drop multiplexer (OADM) system and other complex networks. Michelson-Gires-Tournois interferometer (MGTI) interleaver is one of the typical schemes. It has the characteristics of compact size, low cost, simple parameters, high performance and so on. The theoretical iteration to determine the period of the MGTI interleaver is deduced from mathematical aspect, and some examples are given in detail to support it. When the reflectances of Gires-Tournois etalon (GTE) mirrors are changed, the characteristics of the intersection of the odd and even output spectrum for symmetrical and asymmetrical interleavers are different. Examples of these different characteristics are given. These conclusions will be useful for designing interleavers based on MGTI that have specified period and bandwidth characteristics. It also has instructional function for the design of special optical interference filter.