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Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity

Pham, X. and Si, J. and Chen, T. and Wang, R. and Yan, L. and Cao, H. and Hou, X. (2018) Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity. Journal of Applied Physics, 123 (17): 174501. ISSN 218979

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Abstract

In this paper, we propose a demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance "cut-off wavelengths." The idea of a "cut-off wavelength" and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401-1.4570 RI range when our proposed demodulation method is used. © 2018 Author(s).

Item Type: Article
Divisions: Faculties > Faculty of Control Engineering
Identification Number: 10.1063/1.5025645
Uncontrolled Keywords: Fiber Bragg gratings; Optical variables measurement; Refractive index; Cladding mode resonances; Cross sensitivity; Cutoff wavelengths; Demodulation method; Determination methods; High sensitivity; Temperature-induced; Tilted fiber Bragg grating; Demodulation
Additional Information: Language of original document: English.
URI: http://eprints.lqdtu.edu.vn/id/eprint/9564

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