短波通截止滤光片(SWPF)能够对公共电视天线(CATV)传输系统中的不同信号进行抑制和区分，是光纤CATV传输系统中的重要组成器件。为了降低传输噪声，改善信号传输质量，针对传输系统中截止滤光片的参数要求，选择适合的薄膜材料。通过建立膜系结构的等效层模型，对其求导模拟测试结果，并对膜料光控tooling值及对特定敏感度较高膜层的膜厚进行调整，解决了实际镀膜过程中的膜层失配问题，制备了采用较少膜层的短波通截止滤光片，在1110~1360nm波段反射率小于1%，在1490nm±20nm波段透射率小于0.08%，在1550nm±20nm波段透射率小于0.05%。该滤光片可以满足CATV传输系统环境使用要求。

The shortwave-pass cutoff filter (SWPF) can be used into the community antenna television (CATV) to restrain and distinguish diverse signals. It is the important component in the CATV transmission systems. The film is studied in order to reduce the transmission noise and improve the quality of signals. On account of the demands for parameters of the cutoff filter during the transmission systems, the suitable material of the thin film is determined. The testing results are gained from the equivalent model of the film. The light-operated tooling values of the coating materials and the thickness of the specifically higher sensitive film are adjusted. Conclusively, the mismatching of the film is removed during the coating process. The SWPF with less layers is fabricated. The reflectance is less than 1% from 1100 nm to 1360 nm, while the transmittance is less than 0.08% at 1490 nm ±20 nm and the transmittance is less than 0.05% at 1550 nm±20 nm. It is found that the film can meet the requirements of CATV transmission systems.