A polarization-independent torsion sensor based on the near-helical long period fiber grating

Zhihang Han; Cuiting Sun; Xiren Jin; Hang Jiang; Chong Yao; Shuo Zhang; Weiliang Liu; Tao Geng; Feng Peng; Weimin Sun; Libo Yuan

doi:10.3788/COL201816.100601

Journals >Chinese Optics Letters >Volume 16 >Issue 10 >Page 100601 > Article

Chinese Optics Letters
Vol. 16, Issue 10, 100601 (2018)

A polarization-independent torsion sensor based on the near-helical long period fiber grating

Zhihang Han¹, Cuiting Sun¹, Xiren Jin¹, Hang Jiang¹, Chong Yao¹, Shuo Zhang¹, Weiliang Liu¹, Tao Geng^1、*, Feng Peng^2、**, Weimin Sun¹, and Libo Yuan³

Author Affiliations

¹College of Science, Harbin Engineering University, Harbin 150001, China

²School of Physics and Technology, University of Jinan, Jinan 250022, China

³Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China

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DOI: 10.3788/COL201816.100601 Cite this Article Set citation alerts

Zhihang Han, Cuiting Sun, Xiren Jin, Hang Jiang, Chong Yao, Shuo Zhang, Weiliang Liu, Tao Geng, Feng Peng, Weimin Sun, Libo Yuan. A polarization-independent torsion sensor based on the near-helical long period fiber grating[J]. Chinese Optics Letters, 2018, 16(10): 100601 Copy Citation Text

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Abstract

A torsion sensor based on the near-helical (NH) long period fiber grating (LPFG) is fabricated by using a high frequency pulsed CO₂ laser. Each groove of the NH-LPFG is spirally written in the four sides of a single-mode fiber. The NH-LPFG has a helical periodic vertical index modulation. This is different from the screw-type index modulation of the common helical LPFGs (H-LPFGs) fabricated in a twisted fiber. The torsion and temperature characteristics of the NH-LPFG are experimentally investigated. The temperature sensitivity is about 0.0668 nm/°C. The torsion sensitivity is 0.103 nm/(rad/m) and independent of the polarization state of incident light.