研制了一种基于DWDM角度调谐薄膜滤光片的新型三端口可调带通光学滤波器，它由三个单芯光纤准直器和一片特别设计的角度调谐窄带多腔薄膜滤光片组成.通过一台步进电机控制滤光片的入射角度实现了可调谐滤波，同时对于剩余波长信号没有影响继续传输.对该三端口可调滤波器进行了理论计算和实验研究，并对该器件的串扰特性进行了详细分析与计算.实验中得到的相邻信道隔离度接近30 dB，可调谐范围大于26 nm，与理论设计较为一致.

A novel three-port band-pass tunable filter based on DWDM angle-tuned thin-film filter was proposed.The tunable filter consists of three single-fiber collimators and one particular designed angle-tuned narrowband multiple cavities thin film filter.By the controlling of a stepping motor,the tunable filter can choose any particular wavelength to the drop port,and reflected wavelengths can go out from another port without any interrupt.With the theoretical calculation and the experiment research,the characteristics of the three-port tunable filter was analyzed,especially the crosstalk was calculated in detail.In the experiment,the channel isolation was at about 30dB and its tunable range was over 26 nm,which was coinciding with the result of theoretical design.