Chinese Optics Letters, 2018, 16 (10): 100601, Published Online: Oct. 12, 2018
A polarization-independent torsion sensor based on the near-helical long period fiber grating 
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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.
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.
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