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Title: Single-ring suspended fiber for Bragg grating based hydrostatic pressure sensing
Authors: Htein, L 
Liu, ZY 
Gunawardena, D 
Tam, HY 
Issue Date: 1-Apr-2019
Source: Optics express, 1 Apr. 2019, , v. 27, no. 7, p. 9655-9664
Abstract: We present a novel optical fiber composed of a suspended core, a supporting ring and an outer ring. To establish a large holey region, a germanium-doped core is suspended by a silica ring and the entire structure is enclosed by another silica ring. By monitoring the Bragg wavelength shift of an FBG written in such a fiber with an air filling fraction of 65%, a hydrostatic pressure sensitivity of -43.6 pm/MPa was achieved experimentally. The high-pressure sensitivity is in good agreement with the numerically calculated value of similar to 40 pm/MPa. Due to the significant impact of the fiber core suspended in the large holey region inside the fiber, the pressure sensitivity improved by approximately eleven times compared to a Bragg grating inscribed in a standard single-mode fiber. To the best of our knowledge, it is the highest pressure sensitivity obtained for a FBG-based sensor experimentally, when compared to other FBG-based pressure sensors reported up to date. The large air hole region and the suspended core in the center of the fiber not only make the proposed fiber sensor a good candidate for pressure measurements, especially in the oil industry where space is at a premium, but also allow the detection of substances, by exploiting interaction of light with liquids or gases. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.27.009655
Rights: © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (https://www.osapublishing.org/library/license_v1.cfm)
Journal © 2019
© 2019 Optical Society of America. 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 Lin Htein, Zhengyong Liu, Dinusha Gunawardena, and Hwa-Yaw Tam, "Single-ring suspended fiber for Bragg grating based hydrostatic pressure sensing," Opt. Express 27, 9655-9664 (2019) is available at https://dx.doi.org/10.1364/OE.27.009655
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