单模光纤中受激布里渊散射的Stokes光频移的温度传感特性研究

Research on Temperature Sensing Characteristics of Stokes Optical Frequency Shift of SBS in SMF

首先从单模光纤中声学声子、泵浦光子和stokes光子的频率之间的波矢关系出发,理论推导了单模光纤中的stokes光频移与工作环境温度之间的传感模型。接着设计了一个基于受激布里渊散射(SBS)效应的多波长掺铒光纤激光器的结构装置,并实验测试了该多波长光纤激光器的Stokes光频移随外界温度的变化曲线。实验结果表明:Stokes光频率漂移量和温度之间存在很好的线性关系,且随着温度的升高,高阶Stokes光频移对温度的频移系数高于低阶Stokes光。

The sensing model between the frequency shift of stokes in a single mode fiber(SMF)and the operating environment temperature was deduced theoretically,which are deduced from the wave-vector relations between acoustic phonons,pump photons and stokes photons in SMF.Then an experimental structure of a multi-wavelength erbium doped fiber laser based on the SBS effect is designed.And The curve between the Stokes optical frequency shift and the external temperature is experimentally measured.The experimental results showed that:there is a good linear relationship between the Stokes optical frequency drift and the external temperature,and with the increasing of temperature,the frequency shift coefficient of the high-order Stokes light shift is becoming higher than the low-order Stokes light.