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Open AccessArticle

Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain

1
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2
Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
3
Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK
4
Technical Center, Sichuan Changhong Electric Co., Ltd., Mianyang 621000, China
5
Key Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin 150001, China
6
Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
7
Photonics Research Centre, Technological University Dublin, Kevin Street, Dublin 8, Ireland
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(17), 4763; https://doi.org/10.3390/s20174763
Received: 29 July 2020 / Revised: 16 August 2020 / Accepted: 18 August 2020 / Published: 23 August 2020
(This article belongs to the Special Issue Optical Fiber Sensors)
Negative curvature hollow core fiber (NCHCF) is a promising candidate for sensing applications; however, research on NCHCF based fiber sensors starts only in the recent two years. In this work, an all-fiber interferometer based on an NCHCF structure is proposed for the first time. The interferometer was fabricated by simple fusion splicing of a short section of an NCHCF between two singlemode fibers (SMFs). Both simulation and experimental results show that multiple modes and modal interferences are excited within the NCHCF structure. Periodic transmission dips with high spectral extinction ratio (up to 30 dB) and wide free spectral range (FSR) are produced, which is mainly introduced by the modes coupling between HE11 and HE12. A small portion of light guiding by means of Anti-resonant reflecting optical waveguide (ARROW) mechanism is also observed. The transmission dips, resulting from multimode interferences (MMI) and ARROW effect have a big difference in sensitivities to strain and temperature, thus making it possible to monitor these two parameters with a single sensor head by using a characteristic matrix approach. In addition, the proposed sensor structure is experimentally proven to have a good reproducibility. View Full-Text
Keywords: fiber interferometers; negative curvature hollow core fiber; optical fiber sensors; simultaneous measurement; temperature; strain fiber interferometers; negative curvature hollow core fiber; optical fiber sensors; simultaneous measurement; temperature; strain
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Liu, D.; Li, W.; Wu, Q.; Zhao, H.; Ling, F.; Tian, K.; Shen, C.; Wei, F.; Han, W.; Farrell, G.; Semenova, Y.; Wang, P. Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain. Sensors 2020, 20, 4763.

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