光时域反射计
中继器(钟表)
前置放大器
光放大器
光通信中继器
反射计
放大器
信号(编程语言)
光纤
光纤分路器
光学
光交叉连接
时域
计算机科学
物理
光纤传感器
电信
带宽(计算)
编码(内存)
人工智能
程序设计语言
激光器
计算机视觉
作者
Muping Song,Wenhe Zhu,Qiaolan Xia,Cong Yin,Yan Lü,Ying Wu,Songlin Zhuang
出处
期刊:Optical Engineering
[SPIE - International Society for Optical Engineering]
日期:2018-02-16
卷期号:57 (02): 1-1
被引量:7
标识
DOI:10.1117/1.oe.57.2.027104
摘要
A phase-sensitive optical time-domain reflectometry (ϕOTDR) system that can detect intrusion over 150 km is presented. The ϕOTDR system uses nonbalanced optical repeaters to extend the sensing distance. The repeater consists of two erbium-doped optical fiber amplifiers (EDFAs) and one Raman amplifier (RA). One EDFA power amplifier amplifies the forward-transmitting pulse, and one EDFA preamplifier is used for the backscattering signal, respectively. The RA helps keeping the power along the fiber stable. The optical repeater is installed at the connection of two adjacent fibers to compensate the power decline due to fiber loss. It is easy to install the repeater midway among the fiber links in the system for longer-distance sensing since there is no need of modifying the original sensing system. The theoretical analysis of the repeater is given to describe its effect on the distributed sensing. In experiments, several ϕOTDR traces show a good agreement with theoretical results. Using the optical repeater, 35-Hz vibration at 151 km is successfully measured with signal-to-noise ratio of 8 dB without extra signal processing.
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