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

Liu, Dejun, Li, Wei, Wu, Qiang, Zhao, Haoyu, Ling, Fengzi, Tian, Ke, Shen, Changyu, Wei, Fangfang, Han, Wei, Farrell, Gerald, Semenova, Yuliya and Wang, Pengfei (2020) Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain. Sensors, 20 (17). p. 4763. ISSN 1424-8220

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Official URL: https://www.mdpi.com/1424-8220/20/17/4763

Abstract

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.

Item Type: Article
Uncontrolled Keywords: fiber interferometers; negative curvature hollow core fiber; optical fiber sensors; simultaneous measurement; temperature; strain
Subjects: H600 Electronic and Electrical Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 24 Aug 2020 08:04
Last Modified: 24 Aug 2020 08:15
URI: http://nrl.northumbria.ac.uk/id/eprint/44169

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