TY - JOUR
T1 - Single-ring suspended fiber for Bragg grating based hydrostatic pressure sensing
AU - Htein, Lin
AU - Liu, Zhengyong
AU - Gunawardena, Dinusha
AU - Tam, Hwa Yaw
N1 - Funding Information:
Hong Kong Polytechnic University (1-ZVGB, 1-BBYE, 1-BBYS).
Publisher Copyright:
©2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
PY - 2019/4/1
Y1 - 2019/4/1
N2 - 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 ~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.
AB - 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 ~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.
UR - http://www.scopus.com/inward/record.url?scp=85064417111&partnerID=8YFLogxK
U2 - 10.1364/OE.27.009655
DO - 10.1364/OE.27.009655
M3 - Journal article
C2 - 31045114
AN - SCOPUS:85064417111
SN - 1094-4087
VL - 27
SP - 9655
EP - 9664
JO - Optics Express
JF - Optics Express
IS - 7
ER -