研制了基于混沌信号相关测距技术的光时域反射仪样机。介绍了该仪器的混沌光源设计，硬件系统结构设计和软件算法流程设计。以G.652.B单模光纤为被测对象，对该仪器检测光纤故障的技术指标进行了分析测试。测试结果表明，在102 km内可实现与距离无关的50 cm空间分辨率，比现有飞行时间测量技术提高了约两个数量级，可实现对光纤不同类型反射事件的识别，完全满足无源光网络中的故障检测。

An optical time domain reflectometer based on chaotic signal correlation ranging technology (COTDR) is designed and developed. The chaotic light source, hardware configuration and software design of the system are presented. By using G.652.B single mode fiber as the test object, technical specifications of the COTDR for fiber fault location are tested. Measured results show that the COTDR can realize a range-independent resolution of 50 cm within at least 102 km, which is raised by about two orders of magnitude compared with the existing flight time measurement technology. Furthermore, it can realize the recognition of the different reflection events in the fiber and meet a requirement of fault location in the passive optical network.