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High-Sensitive Fiber-Optic Refractometer Based on a Core-Diameter-Mismatch Mach–Zehnder Interferometer

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6 Author(s)
Qiangzhou Rong ; Department of Physics, Northwest University, Xi'an, China ; Xueguang Qiao ; Ruohui Wang ; Hao Sun
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An in-fiber Mach-Zehnder interferometer (MZI) for high-sensitive refractive index (RI) measurement is proposed and experimentally demonstrated. The sensing head is formed by a single-mode fiber (SMF) sandwiched between two short sections of thin-core fibers (TCFs), i.e., TCF-SMF-TCF MZI configuration with a length of 9 mm. A well-defined interference pattern is obtained as the result of fiber-core mismatch and core-cladding modes interference. The selected interference dip is extremely sensitive to ambient RI, providing a stable RI response with sensitivity up to 159 nm/RIU for water-based solutions close to the RI of 1.33, making it a good candidate for bio-chemical measurements.

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IEEE Sensors Journal  (Volume:12 ,  Issue: 7 )