Abstract
A high-sensitive and temperature-immune curvature sensor based on all fiber Mach–Zehnder interferometer (MZI) is proposed and experimentally investigated. The sensor is constructed by sandwiching a short section of multimode fiber (MMF) between two single-mode fibers (SMFs) with two bitapers. Experimental results show that the sensor can achieve a maximum sensitivity of -34.3935 nm/m−1 in the curvature range of 2.96-4.19 m−1 and a low temperature cross-sensitivity of -0.0003 m−1/∘C in the temperature range of 30-100 °C. The stability test reveals that the standard error of instability is 0.0004 m−1, indicating the sensor’s capacity of long-term operation. The sensor has advantages of low cost, easy fabrication, large curvature detection range, high curvature sensitivity and temperature immunity, makes it has broad application prospects in the curvature sensing field.
Published Version
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