Ultrasensitive Magnetic Field Measurement Using Two-Mode Microfiber-Based Sensors

Abstract

This study presents a novel fiber-optic magnetic field sensor that synergistically combines a microfiber structure with a developed fiber Bragg grating (FBG)-based interrogation system. The sensor harnesses a two-mode fiber with a precisely engineered ring-index distribution to effectively suppress higher-order modes, thereby establishing a uniform modal interferometer predominantly involving the HE11 and HE12 modes. Experimental investigations reveal that the sensor attains an exceptional sensitivity of up to 29.928 nm/mT, markedly out-performing earlier designs. Furthermore, the FBG interrogation system effectively mitigates temperature-induced cross-sensitivity, offering a low-cost, portable alternative for real-time magnetic field strength detection. This approach provides a significant advancement in measurement precision and compact instrumentation for magnetic field sensing, suitable for a wide range of field applications.

Publication DOI: https://doi.org/10.1109/TIM.2025.3562988
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Funding Information: This work was supported in part by the Science Foundation of Nanjing University of Posts and Telecommunications (NY222139), and in part by Marie Skłodowska-Curie Individual Fellowships in the European Union’s Horizon 2020 Research and Innovation Program u
Additional Information: Copyright © 2025 IEEE. All rights reserved, including rights for text and data mining and training of artificial intelligence and similar technologies. Personal use is permitted, but republication/redistribution requires IEEE permission. See https://www.ieee.org/publications/rights/index.html for more information.
Uncontrolled Keywords: Optical fiber sensors,Sensors,Optical fibers,Magnetic fields,Magnetic sensors,Magnetic liquids,Interference,Optical fiber dispersion,Optical fiber polarization,Refractive index
Publication ISSN: 1557-9662
Last Modified: 01 May 2025 08:43
Date Deposited: 24 Apr 2025 11:02
Full Text Link:
Related URLs: https://ieeexpl ... ument/10973098/ (Publisher URL)
PURE Output Type: Article
Published Date: 2025-04-22
Published Online Date: 2025-04-22
Accepted Date: 2025-04-01
Authors: Feng, Fanbu
Chen, Mengmeng
Jin, Xiaoling
Xu, Enming
Jiang, Chen
Zhou, Kaiming (ORCID Profile 0000-0002-6011-1912)
Sun, Bing
Zhang, Zuxing

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