基于脉冲光的布里渊散射阈值分析

Analysis of Brillouin threshold based on pulsed light

针对连续分布式布里渊光纤传感器的传感特性与阈值问题,根据光纤中泵浦光与斯托克斯光之间耦合波方程,推导出布里渊散射阈值的关系式。通过计算分析该关系式与入射光的脉冲宽度、光纤半径和温度的关系,提出了基于脉冲光布里渊散射的阈值理论估算模型。在实验中,利用布里渊光时域反射仪系统,得出了脉冲光布里渊阈值特性,并与理论模型的结果进行对比分析,实验证明了该脉冲光阈值模型的结果与实验得到的布里渊阈值能够较好地吻合。

Aiming at the problem of Brillouin scattering threshold and sensing characteristics for the distributed optical fiber sensor based on Brillouin scattering, the calculated expression of the Brillouin threshold was received through the coupled equation between the pumping and Stokes wave in optical fiber. Through calculation and analysis the relationship between pulse width, fiber radius and temperature of the relationship with the incident light, theoretical estimation model of Brillouin threshold for pulsed light was proposed for estimating the model theory of optical pulse threshold based on Brillouin scattering. In the experiment, the power relationship between the incident light and scattered light was received using Brillouin optical time domain reflectometer system. By comparing the threshold power under the various definitions, it＇s found that the experimental results are consistent with the theoretical calculations.