Abstract
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.
© 2012 IEEE
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