摘要
为了降低电力通信系统中白噪声和随机多径噪声,提出了2种基于线性调频-光时域反射仪(LFM-OTDR)技术的监测方案,即单频LFM-OTDR方案和频分复用LFM-OTDR(FDM-LFM-OTDR)方案。该监测方案采用LFM光脉冲信号作为探测信号,利用分数阶傅里叶变换将后向散射回来的探测信号变换到分数阶傅里叶域进行信号处理和散射光功率计算,从而能更加有效地分离探测信号和后向噪声。实验结果表明:与单脉冲OTDR方案相比,采用单频LFM-OTDR方案、FDM-LFM-OTDR方案使OTDR的动态范围分别提升了约8.3 dB、11 dB。
In order to reduce the impact of white noise and random multipath noise in power grid optical communication system,two monitoring schemes based on linear frequency modulation-optical time domain reflectometer(LFM-OTDR)technology are proposed,namely single frequency LFM-OTDR scheme and frequency division multiplexing LFM-OTDR(FDM-LFM-OTDR)scheme.In this scheme,LFM optical pulse signal is used as the detection signal,and the backscattered detection signal is transformed into the fractional Fourier domain by fractional Fourier transform for signal processing and scattered light power calculation,so that the detection signal and backscattered noise can be separated more effectively.Compared with the single pulse OTDR scheme,the experimental results show that the dynamic range of OTDR is improved by 8.3 dB and 11 dB respectively by using single frequency LFM-OTDR scheme and FDM-LFM-OTDR scheme.
作者
吴斌
贺云
冯晓芳
谢俊毅
赵晗祺
WU Bin;HE Yun;FENG Xiaofang;XIE Junyi;ZHAO Hanqi(China Southern Power Grid Company Limited,Guangzhou 510530,China)
出处
《光通信技术》
2021年第2期55-59,共5页
Optical Communication Technology
基金
中国南方电网科研项目(0000002020030304XT00002)资助。
关键词
光纤链路监测
光时域反射仪
线性调频信号
分数阶傅里叶变换
optical fiber link monitoring
optical time domain reflectometer
linear frequency modulation signal
fractional Fourier transform
