Etched multicore fiber Bragg gratings for refractive index sensing with temperature in-line compensation

被引:18
|
作者
Hu, Wenbin [1 ]
Li, Chi [1 ,2 ]
Cheng, Shu [1 ,2 ]
Mumtaz, Farhan [1 ,3 ]
Du, Cheng [4 ]
Yang, Minghong [1 ]
机构
[1] Wuhan Univ Technol, Natl Engn Lab Fiber Opt Sensing Technol, Luoshi Rd 122, Wuhan 430070, Peoples R China
[2] Wuhan Univ Technol, Sch Mat Sci & Engn, Luoshi Rd 122, Wuhan 430070, Peoples R China
[3] Wuhan Univ Technol, Sch Informat & Commun Engn, Luoshi Rd 122, Wuhan 430070, Peoples R China
[4] FiberHome Telecommun Technol Co Ltd, 6 Gaoxinsilu, Wuhan 430205, Peoples R China
关键词
OPTICAL-FIBER; SENSOR; FBG; CURVATURE;
D O I
10.1364/OSAC.387019
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A novel refractive index sensor based on etched multicore fiber Bragg gratings with temperature in-line compensation is proposed and experimentally demonstrated. By chemically etching the cladding of the multicore fiber, the six outer cores exhibit the sensitive responses to the surrounding refractive index change, with refractive index insensitive and temperature-sensitive central core inside of the multicore fiber. By using the a central Bragg wavelength in the multicore fiber as temperature compensators, the refractive index sensing can be in-line compensated. Moreover, the distribution of multiple outer cores enables the capability of avoiding the nonhomogeneous performance by averaging and balancing the read-out data. Theoretical analysis and experimental results demonstrate that this structure can easily discriminate the RI and temperature. The maximum sensitivity 42.83 nm/RIU could be obtained at around 1.435 RIU, and the temperature sensitivity is 9.89 pm/degrees C. The proposed structure is able to in-line and in-situ determine refractive index and temperature simultaneously. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码:1058 / 1067
页数:10
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