Xu Yanping, Ren Meiqi, Lu Yang, Lu Ping, Lu Ping, Bao Xiaoyi, Wang Lixian, Messaddeq Younès, LaRochelle Sophie
Opt Lett. 2016 Mar 15;41(6):1138-41. doi: 10.1364/OL.41.001138.
We propose a unique multi-parameter optical fiber sensor based on intramodal stimulated Brillouin scattering of higher-order acoustic modes in inverse-parabolic graded-index fiber (IPGIF) without a mode converter. Both optical modes and acoustic modes guided in the IPGIF are characterized and demonstrated theoretically and experimentally. Simulation analysis shows that the multi-peak feature in the Brillouin gain spectrum of the IPGIF is attributed to the couplings between the guided optical mode and the higher-order acoustic modes. Thanks to the distinct acoustic properties of the peaks induced by the sharp refractive index profile of the IPGIF, the different temperature and strain dependences of the first three Brillouin peaks enable the discrimination of the temperature and strain at an accuracy of 0.85°C and 17.4 με.
我们提出了一种独特的多参数光纤传感器，该传感器基于逆抛物线渐变折射率光纤（IPGIF）中高阶声模的模内受激布里渊散射，无需模式转换器。理论和实验表征并演示了在IPGIF中传导的光学模式和声模式。仿真分析表明，IPGIF的布里渊增益谱中的多峰特征归因于导波光模式与高阶声模之间的耦合。由于IPGIF的陡峭折射率分布所引起的峰具有独特的声学特性，前三个布里渊峰的不同温度和应变依赖性使得能够以0.85°C和17.4 με的精度区分温度和应变。
