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Highly Sensitive Curvature Sensor Using an In-Fiber Mach–Zehnder Interferometer

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8 Author(s)
Ruohui Wang ; Dept. of Phys., Northwest Univ., Xi'an, China ; Jing Zhang ; Yinyan Weng ; Qiangzhou Rong
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A highly sensitive curvature sensor using an in-fiber Mach-Zehnder interferometer is proposed and experimentally demonstrated. The sensor has a simple configuration-a short section of single-mode fiber is sandwiched between two short sections of multimode fibers to achieve a compact in-fiber Mach-Zehnder interferometer. The wavelength shift of selected dip in the Mach-Zehnder interference spectrum responds linearly with curvature and shows a high sensitivity up to -14.40±0.02 * m.

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Sensors Journal, IEEE  (Volume:13 ,  Issue: 5 )