Optical fiber curvature sensor based on few mode fiber |
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Authors: | Jing Chen Ping Lu Deming Liu Jiangshan Zhang Shun Wang Dafeng Chen |
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Institution: | 1. National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology (HUST), Wuhan 430074, China;2. The Department of Electronics and Information Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China |
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Abstract: | An optical fiber curvature sensor based on interference between LP01–LP02 modes of a circularly symmetric few mode fiber (FMF) is presented. The device consists of two single-mode fiber and a 10-cm FMF. The two single-mode fiber is offset-spliced to each end of the FMF. When the optical fiber is kept straight and fixed, the interference pattern appears in the transmitted spectrum. As the fiber device is bent, the visibility of the interference fringes (at 1530 nm) decreases, reaching values close to 0.3. The dynamic range of the device can be tailored by the proper selection of the length of FMF. The relationship between the fringe visibility and the curvature is linear while the curvature is between 11 m−1 and 16 m−1. The result indicates that the compact sensor can be used in the measurement of large curvature, which is also important in structural health monitoring. |
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Keywords: | Few mode fiber Mode interference Curvature Visibility |
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