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Chin. Opt. Lett.
 Home  List of Issues    Issue 10 , Vol. 16 , 2018    10.3788/COL201816.100601


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 Geng1, Feng Peng2, Weimin Sun1, and Libo Yuan3
1 College of Science, [Harbin Engineering University], Harbin 1 50001 , China
2 School of Physics and Technology, [University of Jinan], Jinan 2 5002 2 , China
3 Photonics Research Center, [Guilin University of Electronics Technology], Guilin 541004, China

Chin. Opt. Lett., 2018, 16(10): pp.100601

DOI:10.3788/COL201816.100601
Topic:Fiber optics and optical communication
Keywords(OCIS Code): 060.2430  060.2370  140.3470  

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.

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Received:2018/6/20
Accepted:2018/8/17
Posted online:2018/9/20

Get Citation: Zhihang Han, Cuiting Sun, Xiren Jin, Hang Jiang, Chong Yao, Shuo Zhang, Weiliang Liu, Tao Geng, Feng Peng, Weimin Sun, and Libo Yuan, "A polarization-independent torsion sensor based on the near-helical long period fiber grating," Chin. Opt. Lett. 16(10), 100601(2018)

Note: This work was supported by the National Natural Science Foundation of China (Nos. 61377084, 41174161, and 61775044), the Joint Research Fund in Astronomy (No. U1631239) under cooperative agreement between the National Natural Science Foundation of China (NSFC) and the Chinese Academy of Sciences (CAS), and in part by the Aeronautical Science Foundation of China (No. 201608P6003).



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