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提出了一种基于模拟双折射模块的可调谐偏振光干涉型密集波分复用滤波器(DWDM)的新结构。其由置于起偏和检偏器之间的若干个具有相同结构的模拟双折射模块级联构成。每个模拟双折射模块由两个分别用于分束和合束的双折射晶体、放置于其中的两个具有不同折射率的介质块和一个半波片构成。研究了该滤波器的中心频率的可调谐特性。研究表明,利用该结构的滤波器,在满足一定平坦化要求的情况下,如果小角度旋转模拟双折射模块单元,可以在获得大平坦宽度的通带和阻带以及高隔离度的同时简便地实现中心频率的微调谐。实验中,用单级模拟双折射模块验证了该结构的可行性。
A new architecture of tunable Polarization Interference Dense Wavelength Division Multiplexing Filter (DWDM) based on simulated birefringence module is proposed. It consists of a cascade of several simulated birefringent modules with the same structure placed between the polarizer and the analyzer. Each simulated birefringent module consists of two birefringent crystals for splitting and bundling respectively, two dielectric blocks with different refractive indices placed therein and a half-wave plate. The tunability of the center frequency of the filter is investigated. The research shows that with the filter of this structure, if the birefringent module unit is rotated at a small angle, the passband and the stopband of the large flat width and the high isolation can be easily satisfied while satisfying certain flattening requirements Realize the fine tuning of the center frequency. In the experiment, the feasibility of this structure was verified with a single-stage simulated birefringence module.