光纤公共电视天线传输系统中短波通截止滤光片
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摘要
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1110~1360 nm波段反射率小于1%,在1490 nm±20 nm波段透射率小于0.08%,在1550 nm±20 nm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.
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.
引文
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2 Wu Xiaojun,Wang Hongxing,Li Bifeng,et al..Affect analysis of atmospheric turbulence on fading characteristics in free-space optical system over different environments[J].Chinese J Lasers,2015,42(5):0513001.吴晓军,王红星,李笔锋,等.不同传输环境下大气湍流对无线光通信衰落特性影响分析[J].中国激光,2015,42(5):0513001.
3 Ren Lixia,Zhang Shuangyou,Qian Cheng,et al..Radio-frequency transfer over a long-distance fiber link based on analog phase shift compensation[J].Chinese J Lasers,2015,42(4):0405005.任丽霞,章双佑,钱程,等.基于模拟移相补偿的长距离光纤频率传输[J].中国激光,2015,42(4):0405005.
4 C Y Li,H H Lu,C L Ying,et al..A full-duplex CATV/wireless-over-fiber lightwave transmission system[J].Opt Express,2015,23(7):9221-9232.
5 A Kaur,K S Bhatia,S Singh,et al..Different types of modulation analysis used for CATV transmission system[J].Optik-International Journal for Light and Electron Optics,2014,125(20):5952-5955.
6 K Yu,X Zhou,J Wang,et al..A non-polarization short-wave-pass thin film edge filter[J].Optoelectron Lett,2014,10(4):247-249.
7 Fu Xiuhua,Kou Leilei,Zhang Jing,et al..Fabrication of optical filter film for visible and near-infrared laser communication system[J].Chinese J Lasers,2012,39(12):1207001.付秀华,寇雷雷,张静,等.可见与近红外激光通信系统光学滤光膜的研制[J].中国激光,2012,39(12):1207001.
8 Zhao Xingmei,Shi Jiantao,Guo Hongxiang.Film system design for short-wavelength pass filter[J].J Appl Opt,2006,27(5):415-418.赵兴梅,师建涛,郭鸿香.短波通滤光片膜系设计[J].应用光学,2006,27(5):415-418.
9 Zhang Baisen,Chen Tao,Xiong Yuqing,et al..Design and preparation of medium-wave infrared short-wavelength pass filter[J].Vacuum&Cryogenics,2010,16(3):148-152.张佰森,陈焘,熊玉卿,等.中波红外短波通滤光片的设计与镀制技术研究[J].真空与低温,2010,16(3):148-152.
10 Huang Wei,Zhang Yundong.Method for eliminating the half-wave hole of short-wave passed filter[J].Opt Instrum,1999,21(4-5):145-148.黄伟,张云洞.消除短波通截止滤光片半波孔的方法[J].光学仪器,1999,21(4-5):145-148.
11 X Ma,Y Wang,J Shao,et al..Elimination of the half-wave hole for short-wave pass filter[C].Fifth International Conference on Thin Film Physics and Applications International Society for Optics and Photonics,2004,5774:377-380.
12 Sun Ke.Deposition of short-wave pass filter film on molding optical glass aspherical lens[J].Vacuum,2012,49(6):44-49.孙可.模造光学玻璃非球面镜片短波通滤光膜的镀制[J].真空,2012,49(6):44-49.
13 Hu Haiyang,Fan Zhengxiu,Tang Zhaosheng.Preparation and testing of large size wideband film polarizer[J].Chinese J Lasers,2000,27(2):117-122.胡海洋,范正修,汤兆胜.大尺寸宽带偏振薄膜的制备与测试[J].中国激光,2000,27(2):117-122.