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提出一种新型的光时域反射测量技术,即混沌激光相关法,可突破脉冲飞行法和伪随机信号相关法的瓶颈,获得与测量距离无关的高精度测量.利用长外腔光纤环反馈半导体激光器产生宽带混沌激光作为探测信号,进行光纤反射点探测及分辨率的实验验证,并分析了探测光的衰减对测量结果的影响.结果表明,该技术测量光纤反射事件可获得优于6 cm、与事件位置无关的空间分辨率和至少25km的测量范围.
A new optical time-domain reflectometry technique, chaotic laser correlation method, can break through the bottleneck of pulse-flight method and pseudo-random signal correlation method to obtain high-precision measurement unrelated to the measurement distance.By using the long external fiber ring feedback semiconductor The laser produces wide-band chaotic laser as the detection signal, and performs fiber reflection point detection and resolution verification, and analyzes the influence of the detection light attenuation on the measurement results.The results show that this technique can obtain fiber reflection better than 6 cm, Spatial resolution independent of event location and measurement range of at least 25km.