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

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

来源：Chinese Optics Letters, 2018, 16(10): 100601.

DOI：10.3788/COL201816.100601

• FREQUENCY CO2-LASER PULSES
• WRITTEN

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/degrees C. The torsion sensitivity is 0.103 nm/(rad/m) and independent of the polarization state of incident light.

• 出版日期2018-10-10
• 单位桂林电子科技大学; 哈尔滨工程大学; 济南大学