Abstract
A fiber-optic vector magnetic field sensor based on a large-core-offset Mach–Zehnder interferometer (MZI) infiltrated by magnetic fluid (MF) is proposed and demonstrated in this paper. By large-core-offset fusion splicing of a short single-mode fiber (SMF) between a lead-in SMF and a coupling multi-mode fiber, the MZI with a sub-millimeter length is formed, which is then sealed in an MF-infiltrated glass capillary. Through the MF’s refractive index modulation by external magnetic field, the phase of the light passing through the MZI is altered. As a result, the transmission spectrum can be monitored for the magnetic field measurement. Furthermore, from the axial-asymmetry of the large-core-offset MZI structure, the proposed sensor possesses vectorial magnetic-field-sensing ability. Experiments show that the MF-infiltrated large-core-offset MZI vector magnetic-field sensor can achieve a high wavelength sensitivity of 96.68 pm/Oe in a magnetic field range of 50–130 Oe.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Junying Zhang, Yuanyuan Jiang, Xiongxing Zhang, Haibin Chen, Zilong Guo, and Wei Wang
J. Opt. Soc. Am. B 38(10) 2902-2907 (2021)
Xiang Zi Ding, Hang-Zhou Yang, Xue-Guang Qiao, Pan Zhang, Oin Tian, Qiang Zhou Rong, Nurul Asha Mohd Nazal, Kok-Sing Lim, and Harith Ahmad
Appl. Opt. 57(9) 2050-2056 (2018)
Zhengyong Li, Changrui Liao, Jun Song, Ying Wang, Feng Zhu, Yiping Wang, and Xiaopeng Dong
Photon. Res. 4(5) 197-201 (2016)