Dominguez-Lopez Alejandro, Soto Marcelo A, Martin-Lopez Sonia, Thevenaz Luc, Gonzalez-Herraez Miguel
Opt Lett. 2017 May 15;42(10):1903-1906. doi: 10.1364/OL.42.001903.
A differential pulse-width pair (DPP) Brillouin distributed fiber sensor is implemented to achieve centimetric spatial resolution over distances of several kilometers. The presented scheme uses a scanning method in which the spectral separation between the two probe sidebands is kept constant, while the optical frequency of the pump is swept to scan the Brillouin spectral response. Experimental results show that this method avoids detrimental temporal distortions of the pump pulses, which in a standard implementation prevent the DPP method from operating over mid-to-long distances. Such a novel scanning procedure allows the resolving, for the first time in pure time-domain Brillouin sensors, of 1,000,000 sensing points, i.e., 1 cm spatial resolution over 10 km in a conventional acquisition time.
一种差分脉宽对（DPP）布里渊分布式光纤传感器得以实现，以在数公里的距离上实现厘米级的空间分辨率。所提出的方案采用一种扫描方法，其中两个探测边带之间的光谱间隔保持恒定，同时泵浦光频率被扫描以扫描布里渊光谱响应。实验结果表明，该方法避免了泵浦脉冲有害的时间失真，而在标准实现中，这种失真会阻止DPP方法在中长距离上运行。这种新颖的扫描程序首次在纯时域布里渊传感器中实现了分辨1,000,000个传感点，即在传统采集时间内，在10公里的距离上实现1厘米的空间分辨率。
