Fiber specklegram sensor based on reflective mode rotation in few-mode fiber

Yunhe Zhao, Yutao Guo, Shiqi Chen, Yan Jiang, Siyu Chen, Chengbo Mou, Yunqi Liu, Changle Wang, Kaiming Zhou, Lin Zhang

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Abstract

In this article, a fiber specklegram sensor (FSS) is formed from reflective mode rotation in few-mode fiber (FMF) with tilted fiber Bragg gratings (TFBGs). The FMF-TFBG with different tilt angles has been fabricated and could realize the high-efficient reflective mode conversion from fundamental mode to high-order core modes (LP11, LP21, LP02, LP31, and LP12 modes) simultaneously when the tilt angle is 1.6°. With the twist induced in FMF-TFBG, the recorded LP11, LP21, and LP31 mode specklegram rotated with fiber twisting. The specklegrams' rotation angle is detected using speeded-up robust feature algorithm combined with Canny edge detection algorithm to improve the accuracy. When fiber twist angle changes from -300° to 300°, the specklegram rotation angle of LP11, LP21, and LP31 mode is linearly related to fiber twist angle, with a linearity of 0.515, 0.544, and 0.528, respectively. Therefore, the proposed mode rotation from FMF-TFBG with advantages of low cost, high accuracy, and excellent performances could give rise a new generation of FSS.

Original languageEnglish
Pages (from-to)25763-25768
Number of pages6
JournalIEEE Sensors Journal
Volume24
Issue number16
Early online date9 Jul 2024
DOIs
Publication statusE-pub ahead of print - 9 Jul 2024

Bibliographical note

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Funding

National Natural Science Foundation of China (62005157), \u201CChenguang Program\u201D supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission, and Shanghai Sailing Program (20YF1416800). This work was supported in part by the National Natural Science Foundation of China under Grant 62005157, in part by the \u201CChenguang Program\u201D through the Shanghai Education Development Foundation and the Shanghai Municipal Education Commission, and in part by the Shanghai Sailing Program under Grant 20YF1416800. (Corresponding author: Yunhe Zhao.) Yunhe Zhao is with the Institute of Logistics Science and Engineering, Shanghai Maritime University, Shanghai 201306, China, and also with the State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China (e-mail: [email protected]).

FundersFunder number
Shanghai Municipal Education Commission
Chenguang Program
Shanghai Education Development Foundation
National Natural Science Foundation of China62005157
Shanghai Sailing Program20YF1416800

    Keywords

    • Few-mode fiber
    • Fiber gratings
    • Fiber specklegram sensor
    • Mode rotation
    • Optical fiber dispersion
    • Optical fiber networks
    • Optical fiber sensors
    • Optical fiber theory
    • Resonance
    • Sensors
    • Tilted fiber Bragg grating

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