Journal
SENSORS
Volume 20, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/s20174763
Keywords
fiber interferometers; negative curvature hollow core fiber; optical fiber sensors; simultaneous measurement; temperature; strain
Funding
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110320]
- Shenzhen Basic Research Foundation [JCYJ20190808173401660, JCYJ20190808140805488, JCYJ20190808173619062]
- China Postdoctoral Science Foundation [2019M663025]
- National Natural Science Foundation of China [11874332]
- National major scientific research instrument development project of Natural Science Foundation of China [61727816]
- Department for Agriculture, Food and the Marine, Ireland [17F284]
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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 HE(11)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.
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