Journal
OPTICS LETTERS
Volume 43, Issue 24, Pages 5945-5948Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.005945
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Funding
- ORAU Programme at Nazarbayev University (FOSTHER, LIFESTART)
- project Nice-DREAM, Agence Nationale de la Recherche (ANR) [ANR-14-CE07-0016-03]
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We demonstrate and experimentally validate a fiber optic refractive index (RI) sensor obtained by simply etching a high-scattering MgO-based nanoparticle-doped single-mode fiber in hydrofluoric acid (HF). The fiber has 32.3 dB stronger Rayleigh scattering than a standard fiber, allowing a detection of scattering spectral signatures with an optical backscatter reflectometer, even when the core is exposed to the outer RI. The obtained sensitivity is 1.53 nm/RIU (RI units), measured by correlating the scattering spectra. We prove the possibility of implementing a distributed RI detection (seven locations spaced by 1 mm). The fabrication method for this RI sensor is simplified, since it simply requires etching in an HF bath, without the need of inscribing reflective elements or fabricating microstructures in the fiber. (c) 2018 Optical Society of America
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