Compact vector twist sensor using a small period long period fiber grating inscribed with femtosecond laser

Fangcheng Shen; Xuewen Shu; Kaiming Zhou; Haiming Jiang; Hongyan Xia; Kang Xie; Lin Zhang

doi:10.3788/COL202119.090601

Journals >Chinese Optics Letters >Volume 19 >Issue 9 >Page 090601 > Article

Chinese Optics Letters
Vol. 19, Issue 9, 090601 (2021)

Compact vector twist sensor using a small period long period fiber grating inscribed with femtosecond laser

Fangcheng Shen¹, Xuewen Shu², Kaiming Zhou³, Haiming Jiang¹, Hongyan Xia¹, Kang Xie^1、*, and Lin Zhang³

Author Affiliations

¹State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

²Wuhan National Laboratory for Optoelectronics & School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

³Institute of Photonic and Technologies, Aston University, Birmingham B4 7ET, UK

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DOI: 10.3788/COL202119.090601 Cite this Article Set citation alerts

Fangcheng Shen, Xuewen Shu, Kaiming Zhou, Haiming Jiang, Hongyan Xia, Kang Xie, Lin Zhang. Compact vector twist sensor using a small period long period fiber grating inscribed with femtosecond laser[J]. Chinese Optics Letters, 2021, 19(9): 090601 Copy Citation Text

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Abstract

We propose and demonstrate a sensitive vector twist sensor based on a small period long period fiber grating (SP-LPFG) fabricated with a femtosecond (fs) laser. The fabricated SP-LPFG is compact in size (2.8 mm) and shows strong polarization dependent peaks in its transmission spectrum due to the vectorial behavior of high-order cladding modes. Twist sensing is realized by monitoring the polarization dependent peaks, since the polarization of input light changes with fiber twist. The proposed sensor can be interrogated by the peak intensity and wavelength, with high twist sensitivity that reaches 0.257 dB/deg and 0.115 nm/deg, respectively.

Keywords

fiber optical sensor long period fiber grating twist sensor