Fiber Ring Laser Based on Side-Polished Fiber MZI for Enhancing Refractive Index and Torsion Measurement

Bo, Wan, Liu, Bin, Liu, Juan, He, Xing-Dao, Yuan, Jinhui and Wu, Qiang (2022) Fiber Ring Laser Based on Side-Polished Fiber MZI for Enhancing Refractive Index and Torsion Measurement. IEEE Sensors Journal, 22 (8). pp. 7779-7784. ISSN 1530-437X

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A fiber ring laser based on a side-polish fiber Mach-Zehnder interferometer (MZI) for effective improving refractive index (RI) and torsion sensing is proposed and investigated. The side-polished fiber MZI sensor can not only enhance the evanescent wave but also break circular symmetry of optical fiber face section, so it can be used for the surrounding RI and torsion sensing. A spectrum 3 dB bandwidth of less than 0.15 nm has been achieved which makes the fiber ring laser torsion sensing system to have higher measurement resolution. Experiment results show that the RI and torsion sensitivity of proposed sensor is dependent on the polish depth: the thicker the polish depth, the higher the sensitivity. For a sensor with side polish depth of 47 μ m, the measured RI sensitivity reaches-81.36 nm/RIU, the torsion sensitivity is as high as-0.019nm/O, the sensitivity converted to torsional rate is-0.267 nm/(rad. m-1).

Item Type: Article
Additional Information: Funding information: 10.13039/501100001809-National Natural Science Foundation of China (NSFC) (Grant Number: 11864025, 62175097 and 62065013) 10.13039/501100004479-Natural Science Foundation of Jiangxi Province (Grant Number: 20212BAB202024) Key Research and Development Projects of the Ministry of Science and Technology of China (Grant Number: 2018YFE0115700)
Uncontrolled Keywords: Erbium-doped fiber ring laser, Mach-Zehnder interference, refractive index (RI) sensing, side-polished fiber, torsion sensing
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 11 May 2022 13:33
Last Modified: 11 May 2022 13:45

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