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Sensors 2017, 17(9), 2094; https://doi.org/10.3390/s17092094

Sensitivity Enhancement in Low Cutoff Wavelength Long-Period Fiber Gratings by Cladding Diameter Reduction

1
Department of Electrical and Electronic Engineering, Public University of Navarra, 31006 Pamplona, Spain
2
Institute of Smart Cities, Public University of Navarra, 31006 Pamplona, Spain
3
Engineering Photonics, School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield MK43 0AL, UK
4
FIO Laboratory, Electronics Engineering Department, Universidad Autónoma de Tamaulipas, Tamaulipas CP 88740, Mexico
5
Department of Telecommunications and Electronics, Pinar del Río University, Pinar del Río CP 20100, Cuba
*
Author to whom correspondence should be addressed.
Received: 16 August 2017 / Revised: 7 September 2017 / Accepted: 12 September 2017 / Published: 13 September 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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Abstract

The diameter of long-period fiber gratings (LPFGs) fabricated in optical fibers with a low cutoff wavelength was be reduced by hydrofluoric acid etching, enhancing the sensitivity to refractive index by more than a factor of 3, to 2611 nm/refractive index unit in the range from 1.333 to 1.4278. The grating period selected for the LPFGs allowed access to the dispersion turning point at wavelengths close to the visible range of the optical spectrum, where optical equipment is less expensive. As an example of an application, a pH sensor based on the deposition of a polymeric coating was analyzed in two situations: with an LPFG without diameter reduction and with an LPFG with diameter reduction. Again, a sensitivity increase of a factor of near 3 was obtained, demonstrating the ability of this method to enhance the sensitivity of thin-film-coated LPFG chemical sensors. View Full-Text
Keywords: fiber optics sensors; fiber bragg gratings; fibers; single-mode; etching; pH sensor fiber optics sensors; fiber bragg gratings; fibers; single-mode; etching; pH sensor
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Del Villar, I.; Partridge, M.; Rodriguez, W.E.; Fuentes, O.; Socorro, A.B.; Diaz, S.; Corres, J.M.; James, S.W.; Tatam, R.P. Sensitivity Enhancement in Low Cutoff Wavelength Long-Period Fiber Gratings by Cladding Diameter Reduction. Sensors 2017, 17, 2094.

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