Zou Lufan, Bao Xiaoyi, Yang Shiquan, Chen Liang, Ravet Fabien
Fiber Optics Group, Department of Physics, University of Ottawa, Ontario, Canada.
Opt Lett. 2006 Sep 15;31(18):2698-700. doi: 10.1364/ol.31.002698.
The effect of Brillouin slow light on distributed Brillouin fiber sensors (DBFSs) is studied. We demonstrate Brillouin slow light for a 1.2 ns pulse with peak powers (PS) from 3.3 to 56.2 mW on depletion of the pump power (PP) ranging from 1.3 to 83.2 mW in conventional optical fibers (SMF-28). Experiments show that, when pump power depletion is not negligible, for a given PP the Brillouin gain and delay time of a pulse decrease when PS increases in a long (> or =10 km) sensing fiber. The optimum pump beam depletion resulting from strong interaction of the pump and the probe in the fiber provides accurate temperature and strain information at a high spatial resolution. Our study reveals that at low PP the spatial resolution error caused by the pulse delay for a DBFS with centimeter spatial resolution is less than 5% of the pulse length.
研究了布里渊慢光对分布式布里渊光纤传感器（DBFS）的影响。我们在常规光纤（SMF - 28）中，针对泵浦功率（PP）在1.3至83.2 mW范围内耗尽的情况，展示了峰值功率（PS）为3.3至56.2 mW的1.2 ns脉冲的布里渊慢光。实验表明，当泵浦功率耗尽不可忽略时，对于给定的PP，在长（≥10 km）传感光纤中，随着PS增加，脉冲的布里渊增益和延迟时间会减小。泵浦光与探测光在光纤中的强相互作用导致的最佳泵浦光束耗尽，能在高空间分辨率下提供准确的温度和应变信息。我们的研究表明，在低PP时，对于具有厘米级空间分辨率的DBFS，由脉冲延迟引起的空间分辨率误差小于脉冲长度的5%。
