doi: 10.17586/2226-1494-2020-20-6-780-785


SENSITIVITY VARIATION RESEARCH OF TILTED FIBER BRAGG GRATING DURING CHEMICAL ETCHING

D. O. Gagarinova, S. A. Plyastsov, L. L. Lesnykh, A. A. Dmitriev, I. D. Tokareva, S. D. Bochkova


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Gagarinova D.O., Plyastsov S.A., L.L Lesnykh, Dmitriev A.A., Tokareva Ia.D., Bochkova S.D. Sensitivity variation research of tilted fiber Bragg grating during chemical etching. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2020, vol. 20, no. 6, pp.  780-785 (in Russian). doi: 10.17586/2226-1494-2020-20-6-780-785


Abstract
Subject of Research.The paper presents experimental results of the chemical etching duration impact on the tilted fiber Bragg grating transmission spectrum. The goal of this research is the sensitivitygrowth of the tilted fiber Bragg grating aimed at its application as an element of fiber optical sensor for refractive index ofliquids measurements. Method. The chemical etching was performed in the 50 % hydrofluoric acid solution. The chemical etching duration was 5, 10, 15, 20 and 30 minutes with pauses for spectra measurements. The spectrum of the tilted fiber Bragg grating was measured at every research step in the media with various refractive index. Main Results. The sensitivity estimation of the tilted fiber Bragg grating to the variation of refractive index is performed. The decrease of the optic fiber thickness as a result of chemical etching leads to lower responsivity of the sensor Practical Relevance. Experimental research shows that chemical etching decreasesthe sensitivity of tilted fiber Bragg grating to the refractive index variation for the medium under study. Analysis of measurement results is applicable in the design and development of concentration optic fiber sensors or solution refractive index of the researched material.

Keywords: chemical etching, tilted fiber Bragg grating, optic fiber sensor, cut-off wavelength, sensitivity, refractive index

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