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A novel humidity sensor based on an in-fiber Mach–Zehnder interferometer (MZI) is proposed and demonstrated. The sensor head is formed by a single-mode–multimode–single-mode (SM–MM–SM) fiber structure through arc fusion splicing. The intermodal interference is achieved by two waist-enlarged fiber tapers at the coupling points of the multimode fiber and single-mode fibers. The sensor has a linear response...
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