刘贺　王涛

摘 要： 为了解决以往光纤通信局域网断点故障检测方法成本高、动态检测区间小的问题，提出基于混沌光的光纤通信局域网断点故障检测方法。构建可调谐混沌光产生装置，将混沌光波长失调值设为0 nm，带宽设为光纤通信局域网带宽的80%，获取混沌光，构成光纤通信局域网信道的参考信号和探测信号，利用光纤振荡器过滤其中的延时信号，对混沌光信号与探测信号进行相关性运算，获取断点故障定位值。实验结果表明，所提方法在检测断点故障时的动态检测区间大，并能维持光纤通信正常运行。

关键词： 光纤通信； 局域网； 断点故障检测； 混沌光； 相关性运算

中图分类号： TN926+.3?34； TM248 文献标识码： A 文章编号： 1004?373X（2017）16?0174?03

Abstract： Since the previous breakpoint fault detection method of optical fiber communication LAN has high cost and narrow dynamic detection section， a chaotic light based breakpoint fault detection method of optical fiber communication LAN is proposed. The generation device of tunable chaotic light was constructed to set the wavelength detuning value of the chaotic light to 0 nm and the bandwidth of the fiber communication LAN to 80%. The chaotic light is got to compose the reference signal and detection signal of the optical fiber communication LAN channel. The optical fiber oscillator is adopted to filter the delay signal. The correlation operation is carried out for the chaotic light signal and detection signal to obtain the positioning value of breakpoint fault. The experimental results indicate that the method has long dynamic detection section while detecting the breakpoint fault， and can maintain the normal operation of optical fiber communication.

Keywords： optical fiber communication； local area network； breakpoint fault detection； chaotic light； correlation operation

得益于光纖通信技术的飞速进步，光纤通信局域网已经走进每家每户，针对局域网故障检测的器件和方法也逐渐增多起来。断点故障普遍存在于光纤通信局域网中，光时域反射仪可针对断点故障进行良性检测，使用方法便捷，但价格昂贵，各大品牌的平均报价[1]要高于2.5万元。典型的断点故障检测方法包含距离传感检测和谐波检测，这些方法的成本低于光时域反射仪，能够满足正常检测需求，缺陷是动态检测区间小。相对来讲，光时域反射仪的市场竞争力更大。本文利用混沌光进行断点故障检测，提出一种成本低、动态检测区间大的检测方法。

1 光纤通信局域网断点故障检测方法研究

1.1 检测方法

在非线性研究领域，混沌是指存在却不能加以估计的波动行为。……