紫外光通信系统的噪声研究  

Research on noise in ultraviolet communication systems

作　　者：徐浩然[1] 左勇[1] 张文博[1] 范成[1] 吴朝烨[1] 伍剑[1] 

机构地区：[1]北京邮电大学信息光子学与光通信研究院信息光子学与光通信国家重点实验室,北京100876

出　　处：《光通信研究》2013年第2期65-69,共5页Study on Optical Communications

基　　金：国家"八六三"计划资助项目(2008AA12Z225);教育部青年科研创新计划资助项目(2012RC0405)

摘　　要：在UV(紫外光)通信系统中,噪声对信号会产生比较明显的干扰。为了提高系统的通信性能,文章对UV通信系统中的噪声进行了分析。设计了一个模块对噪声进行采样,并分析了PMT(光电倍增管)暗电流噪声、PCB(印制电路板)热噪声、EMI(电磁干扰)噪声以及电源引入的噪声等4种噪声的时域和频域特性,及其对系统性能的影响。为了克服模拟滤波性能不理想的缺点,在接收端采用FPGA(现场可编程门阵列)设计了一个数字滤波器来抑制噪声。实验结果表明,该数字滤波器对SNR(信噪比)有3～7dB的改善。Noises in the Ultraviolet （UV） communication system bring about significant interference in signal transmission. In order to improve the system performance, this paper designs a module to sample the noises in the system, including Photomul-tiplier Tube （PMT）, dark current noise, PCB hot noise, Electromagnetic Interference （EMI） noise and noises induced by pow-er source and analyze their characteristics in time and frequency domains and their effects on the system performance. To over-come the disadvantages of analog filters, it develops a digital filter at the receiver end by using FPGA to suppress the noise. The experimental results show that this digital filter imoroves the Signal to Noise Ratio （SNR） bv 3-7 dB.

关 键 词：紫外光通信 噪声 数字滤波器 现场可编程门阵列 

分 类 号：TN929.12[电子电信—通信与信息系统]