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Photonics 2019, 6(2), 40; https://doi.org/10.3390/photonics6020040

Refractive Index Sensor Based on Twisted Tapered Plastic Optical Fibers

1
Photonics Research Centre, Guilin University of Electronic Technology, Guilin 541004, China
2
Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China
3
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
*
Authors to whom correspondence should be addressed.
Received: 11 February 2019 / Revised: 31 March 2019 / Accepted: 3 April 2019 / Published: 9 April 2019
(This article belongs to the Special Issue Polymer Optical Fibre)
PDF [934 KB, uploaded 9 April 2019]

Abstract

We proposed a refractive index (RI) sensor employing two twisted tapered plastic optical fibers (POFs). The tapered POFs were fabricated by a heating and drawing method and were twisted around each other to form a coupled structure. The sensor consisted of two input ports, a twisted region, and two output ports. The tapered POF could make the light couple from one POF to the other easily. The twisted tapered POFs could constitute a self-referencing sensor, and by monitoring the changes of the coupling ratio, the variations of the external medium RIs could be measured. The RI sensing performances for the sensors with different fiber diameters and twisted region lengths were studied. The sensitivities of 1700%/RIU and −3496%/RIU in the RI ranges of 1.37–1.41 and 1.41–1.44 were obtained, respectively. The sensor is a low-cost solution for liquid RI measurement, which has the features of simple structure and easy fabrication.
Keywords: refractive index sensor; plastic optical fiber; twisted tapered structure refractive index sensor; plastic optical fiber; twisted tapered structure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Teng, C.; Deng, H.; Liu, H.; Yang, H.; Yuan, L.; Zheng, J.; Deng, S. Refractive Index Sensor Based on Twisted Tapered Plastic Optical Fibers. Photonics 2019, 6, 40.

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