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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。
A chaotic optical time-domain reflectometer (COTDR) based on Boolean chaotic direct modulation laser was developed to achieve high-precision diagnosis of optical fiber faults. The instrument uses Boolean chaos as a modulation signal, and the chaotic laser is directly output by a DFB laser driven by a drive circuit. The chaotic light is split into two paths by a fiber coupler, and one is used as a reference light and the other is used as a probe light, which is injected into the fiber under test , The echo signal reflected by the fault point and the reference light are sampled by the photoelectric conversion. Finally, the two sets of sample data cross-correlation processing, according to the peak value to determine the location of the fault point. The experimental results show that the COTDR in this paper can detect the optical fiber mismatch reflection point such as the connection point and breakpoint, and can achieve the spatial resolution of 24cm which has nothing to do with the distance in the measuring range of 98km. The COTDR in this paper has the advantages of simple structure, low cost, easy integration and product realization, and meets the actual needs of engineering application.