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Title: Torsion sensor based on inter-core mode coupling in seven-core fiber
Authors: Tan, FZ 
Liu, ZY 
Tu, JJ 
Yu, CY 
Lu, C 
Tam, HY 
Issue Date: 2018
Source: Optics express, 6 Aug. 2018, v. 26, no. 16, p. 19835-19844
Abstract: We proposed a novel torsion sensor based on inter-core mode coupling in sevencore fiber (SCF). The torsion sensor is fabricated by tapering a commercially available SCF spliced with two single mode fibers. Waist diameter and length of the taper structure were experimentally optimized to achieve good transmission spectrum. Based on this structure, the torsion measurement was conducted, and the experimental results demonstrated that the transmission spectrum shows a red shift with the fiber twist. The torsion sensitivity increases with the twisting angle, which can achieve as high as 1.00 nm/degrees. The direction of wavelength shift was observed to be opposite when twisting the tapered SCF in clockwise and counter-clockwise direction, demonstrating its capability to discriminate the rotation orientation. Moreover, all the measurements were repeated in attempts to confirm its stable performance as well as high accuracy. Mode coupling dynamics and theory of optical anisotropy in twisted fiber are adopted to discuss the sensitivity performance, which agrees well with experimental results. The novel torsion sensor could provide a promising candidate for the applications requiring accurate rotation.
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.26.019835
Rights: Journal © 2018
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (https://www.osapublishing.org/library/license_v1.cfm#VOR-OA)
Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
The following publication Fengze Tan, Zhengyong Liu, Jiajing Tu, Changyuan Yu, Chao Lu, and Hwa-Yaw Tam, "Torsion sensor based on inter-core mode coupling in seven-core fiber," Opt. Express 26, 19835-19844 (2018) is available at https://dx.doi.org/10.1364/OE.26.019835
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