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Open AccessArticle

Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

1
School of Electrical and Electronics Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2
Temasek [email protected], 50 Nanyang Avenue, Research Techno Plaza, Singapore 637553, Singapore
3
Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK
*
Author to whom correspondence should be addressed.
This paper is an extended version of Tan, R.X.; Ho, D.; Tse, C.H.; Yoo, S.W.; Tjin, S.C.; Ibsen, M. Bragg Grating Inscribed C-Shape Optical Fiber for Temperature and Strain Insensitive Refractive Index Sensing. In Proceedings of the 6th International Symposium on Sensor Science (I3S 2018), Kenting, Taiwan, 6–8 August 2018.
Sensors 2018, 18(10), 3285; https://doi.org/10.3390/s18103285
Received: 31 August 2018 / Revised: 23 September 2018 / Accepted: 27 September 2018 / Published: 29 September 2018
(This article belongs to the Special Issue I3S 2018 Selected Papers)
We demonstrate a simple-to-fabricate refractometer based on the inscription of fiber Bragg gratings in a special C-shaped optical fiber. The C-shaped fiber was drawn into shape using a quarter cladding removed preform of a commercial standard single-mode fiber by simple machining. The sensor did not suffer from cross-sensitivity of the refractive index with ambient temperature fluctuations, commonly occurring with many optical fiber refractometers. A refractive index sensitivity of 1300 pm per refractive index unit (RIU) was achieved without employing any additional sensitization techniques such as tapering or etching. View Full-Text
Keywords: fiber sensors; fiber Bragg gratings; specialty fibers; refractometers fiber sensors; fiber Bragg gratings; specialty fibers; refractometers
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Tan, R.X.; Ho, D.; Tse, C.H.; Tan, Y.C.; Yoo, S.W.; Tjin, S.C.; Ibsen, M. Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer. Sensors 2018, 18, 3285.

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