Twist Sensor Based on Long Period Grating and Tilted Bragg Grating Written in Few-Mode Fibers

Kang Yang; Yange Liu; Zhi Wang; Yan Li; Ya Han; Hongwei Zhang

doi:10.1109/JPHOT.2018.2824331

IEEE Photonics Journal (Jan 2018)

Twist Sensor Based on Long Period Grating and Tilted Bragg Grating Written in Few-Mode Fibers

Kang Yang,
Yange Liu,
Zhi Wang,
Yan Li,
Ya Han,
Hongwei Zhang

Affiliations

Kang Yang: ORCiD; Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin, China
Yange Liu: ORCiD; Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin, China
Zhi Wang: ORCiD; Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin, China
Yan Li: ORCiD; Institute of Information Technology Handan University, Handan, Hebei, China
Ya Han: ORCiD; Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin, China
Hongwei Zhang: Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin, China

DOI: https://doi.org/10.1109/JPHOT.2018.2824331
Journal volume & issue: Vol. 10, no. 3
pp. 1 – 8

Abstract

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A twist sensor based on a few-mode long period grating (LPG) and a tilted fiber Bragg grating (TFBG) is proposed and demonstrated. The LPG, inscribed in a step index few-mode fiber by a CO2 laser, is utilized to excite the LP11 core mode. The followed TFBG written in graded index a few mode fiber with the LP11 core mode as exciting light is served as sensing element. By analyzing transmitted intensity difference of two dips in transmission spectrum of the TFBG induced by the mode couplings from forward-propagating LP11 core mode to backward-propagating LP11 and LP21 core modes, a twist sensitivity of 1.074 dB/(rad/m) from -5.23 rad/m to 5.23 rad/m is achieved. The proposed sensor has advantages of easy operation and simple structure.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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