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We propose a novel M-shaped single mode fiber (M-SMF) sensor based on stimulated Brillouin scattering of higher-order acoustic modes for simultaneous temperature and strain measurement. Numerical investigation of longitudinal acoustic modes in the M-SMF shows that multi-peak Brillouin spectrum in M-SMF is contributed by the couplings between the LP01 optical mode and multiple acoustic modes. The Brillouin...
A simple and high-degree accuracy sensor for solution concentration and temperature based on fused tapering optical fiber coupler is fabricated. The change of refractive index in the evanescent field on the fused region of an optical fiber coupler shifts the output coupling visibility. Therefore the coupling visibility is changed with variation of solution concentration (refractive index) and temperature...
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