基于非相干光频域反射技术的高精度光纤网络健康在线监测系统  

High-Precision Optical Fibre Network Health Online Monitoring System Based on Incoherent Optical Frequency Domain Reflection Technology

作　　者：于淼 吉顺兵 刘海[2] 杨光[3] 黄圣军 刘军 何禹潼 孙铭阳 Yu Miao;Ji Shunbing;Liu Hai;Yang Guang;Huang Shengjun;Liu Jun;He Yutong;Sun Mingyang(School of Electronic Information,University of Electronic Science and Technology of China,Zhongshan Institute,Zhongshan,Guangdong 528402,China;NO 31131 Unit,PLA,Nanjing,Jiangsu 211112,China;College of Instrumentation&Electrical Engineering,Jilin University,Changchun,Jilin 130012,China)

机构地区：[1]电子科技大学中山学院电子信息学院,广东中山528402 [2]中国人民解放军31131部队,江苏南京211112 [3]吉林大学仪器科学与电气工程学院,吉林长春130012

出　　处：《中国激光》2022年第4期79-88,共10页Chinese Journal of Lasers

基　　金：广东省普通高校青年创新人才项目(2018KQNCX332);广东省引进领军人才计划(00201507);广东省教育厅创团项目(2018KCXTD033);广东省科技计划项目(2021A0101180005);中山市社会公益科技研究项目(2018B1021,2020B2018)。

摘　　要：随着我国高速、大容量、宽带网络的快速发展以及军用短距离战术通信系统的广泛应用,对于通信网络中光纤及无源器件故障的精准定位与实时在线监测日趋重要。本文基于非相干光频域反射(IOFDR)技术机理,以光纤中后向瑞利散射光作为信号光,并结合光波传导方程,提出了一种低成本、高精度、分布式光纤质量检测方法,并对其数值模型进行了详细推导,设计系统结构,研制系统样机。通过实验验证,采用非相干连续光源,可以以较低的光功率(<10 mW)初步实现10 km光纤的分布式检测,并可保证光纤沿线无差异的空间分辨率0.1 m,动态范围优于34.5 dB,事件盲区极小,可有效解决传统光时域反射技术(OTDR)的注入功率大、空间分辨率低、事件盲区大以及相干光频域反射技术(COFDR)成本高、体积大、测量距离有限等问题,是一种极具发展潜力和推广价值的高精度光纤网络在线健康监测技术。Objective Fibre optic fault affects fibre optic communication quality,data transmission rate and leads to network breakdown.Obtaining line fault information in real-time,accurately locating it,and improving fault maintenance efficiency is an important problem faced by the high-quality and rapid development of the fibre optic communication industry.Optical time-domain reflectometer(OTDR) is a common equipment for fault detection and quality analysis of optical fibre communication links.There are two unavoidable problems due to the limitation of its technical principle.First, the pulse modulation technology used for event location makes OTDR susceptible to the influence of the dispersion effect and widens the pulse width.The longer the measurement distance,the lower the spatial resolution.Second,for a spatial resolution of 1 m,the sampling frequency of OTDR should be at least 200 MHz,and the pulse laser with a pulse width of less than 10 ns and peak power of several watts should be emitted.The luminance efficiency of the light source decreases with high power after a long time of application.The performance of the passive optical devices inside the instrument is affected,leading to different degrees of photosensitive surface damage.Further,it reduces the photoelectric conversion efficiency,device life and overall performance of OTDR.Because of coherence and difference frequency detection,the coherent optical frequency domain reflector(COFDR)can allow light detection to have a larger amplitude range.Additionally,the receiver bandwidth can be very low,effectively reducing the noise and improving the dynamic range.However,its detection range is limited by the coherent length,frequency modulation rate and linearity of the tunable light source.Moreover,the development capacity of the ultra-narrow linewidth,single-frequency,coherent laser in China is weak,and the external purchase price is very high.Commercial COFDR costs nearly one million yuan,and the cost performance of engineering applications is not high.Therefore,t

关 键 词：光纤光学 非相干光频域反射技术 光纤故障 高精度定位 在线监测 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]