中文摘要：

研制了一种基于布尔混沌直接调制激光器的混沌光时域反射仪（COTDR）,用于实现光纤故障的高精度诊断。仪器利用布尔混沌作为调制信号,经驱动电路直接调制分布反馈（DFB）激光器输出混沌激光;混沌光经光纤耦合器分为两路,一路作参考光,另一路作探测光,注入到被测光纤中,由故障点反射的回波信号与参考光经光电转换后进行同步采样。最后对两组采样数据进行互相关处理,根据相关峰值判断故障点位置。实验结果表明,本文的COTDR能够检测到光纤的不匹配连接点和断点等反射事件,并在98km测量范围内可实现与距离无关的24cm空间分辨率。本文的COTDR结构简单、成本低,易于实现集成化和产品化,符合工程应用的实际需求。

英文摘要：

With the rapid development of fiber optical communication and fiber to the home,it is urgent to design an optical time domain reflectometer（COTDR）with stable performance,high resolution and low cost for fiber fault detection.In this paper,we propose and demonstrate experimentally and numerically an OTDR using a laser modulated by Boolean chaos to realize the fiber fault detection with high precision.The chaotic laser is generated from the distributed feedback（DFB）laser diode directly modulated by drive circuit and Boolean chaos.The chaotic laser is divided into two parts through a fiber coupler：one serves as reference light,and the other as probe light which is sent down to the test fiber.The echo light from the fault and the reference light are converted into electrical signal and sampled simultaneously.Finally,the fiber fault is detected by correlating the two groups of sampling data.Ex-perimental results show that the unterminated fiber end,mismatch connector and fiber breakpoint can be preciously located.A detection range of approximately 98 km and a range-independent spatial resolution of 24 cm are achieved.The device has a simple structure,low cost,and it is easy to realize integration and product,which is in accordance with the practical requirements of engineering applications.