研制了一种混沌-脉冲混合信号光时域反射仪, 其工作原理是通过连续混沌光与离散脉冲光分别对光纤中的菲涅尔反射与后向瑞利散射进行高精度测量, 将2次测量结果进行线性叠加得到光纤故障测量曲线, 该仪器解决了传统混沌光时域反射仪无法测量光纤损耗事件的问题。实验中利用G.652.B单模光纤作为被测对象, 对该仪器进行了实际测试, 测试结果表明: 所研制的混沌-脉冲混合信号光时域反射仪在104 km测量范围内实现了与距离无关的35 cm空间分辨率测量, 对光纤损耗事件也有良好的检测效果。

A chaotic-pulse hybrid signal optical time-domain reflectometer(OTDR) was developed. The working principle is to measure the Fresnel reflection and backward Rayleigh scattering in the fiber by continuous chaotic light and discrete pulsed light respectively,and finally to obtain the optical fiber fault measurement curve by linear superposition of the measurement results. The instrument can solve the problem that traditional chaotic optical time domain reflectometer can not measure fiber loss events. By using G.652.B single mode fiber as the test fiber, the parameter specifications of the instrument are tested and analyzed. Results show that the instrument can realize a range-independent resolution of 35 cm within at least 104 km. The instrument also has a good detection effect on fiber loss events.