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Curvature and Temperature Discrimination Using Multimode Interference Fiber Optic Structures—A Proof of Concept

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8 Author(s)
Silva, S. ; Dept. de Fis. e Astron. da Fac. de Cienc., Univ. do Porto, Porto, Portugal ; Pachon, E.G.P. ; Franco, M.A.R. ; Jorge, P.
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Singlemode-multimode-singlemode fiber structures (SMS) based on distinct sections of a pure silica multimode fiber (coreless-MMF) with diameters of 125 and 55 μm, were reported for the measurement of curvature and temperature. The sensing concept relies on the multimode interference that occurs in the coreless-MMF section and, in accordance with the length of the MMF section used, two fiber devices were developed: one based on a bandpass filter (self-image effect) and the other on a band-rejection filter. Maximum sensitivities of 64.7 nm·m and 13.08 pm/°C could be attained, for curvature and temperature, respectively, using the band-rejection filter with 55 μm-MMF diameter. A proof of concept was also explored for the simultaneous measurement of curvature and temperature by means of the matrix method.

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Lightwave Technology, Journal of  (Volume:30 ,  Issue: 23 )