doi: 10.17586/2226-1494-2018-18-5-751-757


V. A. Novikova, S. V. Varzhel, A. A. Dmitriev, Y. K. Zalesskaya, R. F. Idrisov

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Novikova V.A., Varzhel S.V., Dmitriev A.A., Zalesskaya Yu.K., Idrisov R.F. Spectral characteristics study of phase-shifted fiber Bragg gratings under pressure applied perpendicular to fiber axis. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2018, vol. 18, no. 5, pp. 751–757 (in Russian). doi: 10.17586/2226-1494-2018-18-5-751-757

Subject of Research.The paper presents the study of effect that occurs when pressure is applied to the phase-shifted fiber Bragg gratings perpendicular to the fiber axis. Method. Fiber Bragg gratings inscription was performed using Talbot interferometer, and the introduction of a phase shift – by means of the electrical discharge of an arc fusion splicer. The excimer laser system was used as a radiation source. The change in the reflection spectra at different pressures on the optical fiber is measured. Main Results. Fiber Bragg gratings with a phase shift are obtained by the procedure that excludes the use of high-precision instruments during the phase-shift introduction step. Experiment results are given showing up the distance dependence between the local minima in the reflection spectrum of fiber Bragg grating with a phase shift on the applied mass arising as a result of the induced birefringence. It is shown that the change in spectral characteristics is related to the birefringence effect owing to stresses inside the fiber. As a result, the second local minimum appears in reflectance band. Practical Relevance. Research results can be used in creation of a sensing element of a fiber optic pressure sensor.  This study demonstrates the application possibilities of Bragg gratings with a phase shift as sensing elements in fiber-optic pressure sensors.

Keywords: fiber Bragg grating, phase shift, Talbot interferometer, excimer laser, pressure sensor, birefringence

Acknowledgements. This work has been performed at ITMO University and supported by the Ministry of Education and Science of the Russian Federation (project No. 03.G25.31.0245).

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