激光与光电子学进展, 2017, 54 (12): 121205, 网络出版: 2017-12-11   

基于LabVIEW的光时域反射仪及反射事件检测分析 下载: 753次

Optical Time Domain Reflectometry Based on LabVIEW and Detection Analysis of Reflection Events
作者单位
江南大学物联网工程学院, 江苏 无锡 214122
摘要
设计了一款基于LabVIEW的光时域反射仪(OTDR), 选用1625 nm波长的脉冲激光模块作为光源, 采用高灵敏度雪崩二极管光电探测器和高速数据采集卡, 在LabVIEW集成化虚拟仪器开发环境控制下, 对光信号进行采集、处理和数据存储, 实现光纤在线实时监控。采用数字平均与加权滑动平均相结合的算法, 对返回的背向散射信号进行降噪, 并定量分析了数字平均次数、平滑宽度、平滑类型对OTDR系统信号处理结果的影响, 从而给出一个最佳平滑模型。采用求一阶导数方法并设置导数和幅度双重阈值, 对反射事件点进行定位。采用该系统对实际光缆线路的测试结果表明, 所提出的最佳平滑滤波器与传统平滑滤波器在相同平滑宽度下相比, 动态范围提高了1.1 dB, 信噪比提高了1.25倍。所提定位算法能较准确地定位反射事件点, 表明该算法具有一定的实用价值。
Abstract
A optical time domain reflectometry (OTDR) system based on LabVIEW is designed. A 1625 nm wavelength pulsed laser module is used as the light source. The high-sensitivity avalanche diode photodetector and high-speed data acquisition card are used to collect, process and storage the optical signal under the control of the LabVIEW integrated virtual instrument development environment, in order to realize on-line real-time monitoring of fiber. An algorithm combining digital average method and weighted sliding-average is adopted to reduce the noise of the returned backscatter signal, and the effect of the digital average time, smooth width and smooth type on the result of signal processing of the OTDR system is quantitively analyzed. Then the best smooth model is given. The first derivative method is used and the double thresholds of derivative and amplitude are set to locate the point of the reflection event. The experimental results of practical optical cable line with the proposed system show that the optimal smoothing filter proposed in this paper improves the dynamic range by 1.1 dB and the signal-to-noise ratio by 1.25 times compared with the traditional smoothing filter at the same smooth width. The proposed positioning algorithm can be used to locate the point of the reflection event accurately, which indicates that the proposed algorithm has certain practical value.

王娟, 倪屹, 郭瑜, 朱星盈. 基于LabVIEW的光时域反射仪及反射事件检测分析[J]. 激光与光电子学进展, 2017, 54(12): 121205. Wang Juan, Ni Yi, Guo Yu, Zhu Xingying. Optical Time Domain Reflectometry Based on LabVIEW and Detection Analysis of Reflection Events[J]. Laser & Optoelectronics Progress, 2017, 54(12): 121205.

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