Abstract
An intensity demodulation strain sensor based on two waist-enlarged tapers is presented. The two waist-enlarged tapers form a Mach-Zehnder (MZ) interferometer. It can be simply fabricated by a commercial splicer and a good physical strength can also be remained for the enlarged taper waist. The MZ interferometer incorporates intermodal interference between core mode and cladding mode. Sensitivity of 0.00215 dBm/µe is achieved experimentally for strain measurement. The proposed sensor has great application due to its low cost, simple construction, and demodulation. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:954–956, 2014
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