Simultaneous distributed strain and temperature measurement based on Brillouin frequency shift (BFS) was demonstrated using a dual-Brillouin-peak single-mode (SM) optical fiber. The fiber is designed and fabricated with enhanced Brillouin gain of higher-order acoustic modes so that the gains of the multiple Brillouin peaks are at a similar level. In a 25-kilometer sensing length with 5-meter spatial resolution, the achieved temperature resolution is 2°C and the strain resolution is 40 microstrain.

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Xiaoguang Sun, Kyle Bedard, Michael Hines, Jie Li, and Robert Dyer, "Simultaneous distributed strain and temperature measurement using a dual-Brillouin-peak optical fiber," Proc. SPIE 11000, Fiber Optic Sensors and Applications XVI, 1100005 (Presented at SPIE Defense + Commercial Sensing: April 16, 2019; Published: 14 May 2019); https://doi.org/10.1117/12.2518523.