DOI: 10.17586/2226-1494-2015-15-5-809-816


CENTRAL WAVELENGTH ADJUSTMENT OF LIGHT EMITTING SOURCE IN INTERFEROMETRIC SENSORS BASED ON FIBER-OPTIC BRAGG GRATINGS

A. S. Aleynik, A. Y. Kireenkov, M. V. Mekhrengin, M. A. Chirgin, M. N. Belikin


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For citation: Aleynik A.S., Kireenkova A.Yu., Mekhrengin M.V., Chirgin M.A., Belikin M.N. Central wavelength adjustment of light emitting source in interferometric sensors based on fiber-optic Bragg gratings. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2015, vol. 15, no. 5, pp. 809–816.

Abstract
The paper is focused on the investigation of fiber-optic interferometric sensor based on the array of fiber Bragg gratings. Reflection spectra displacement mechanism of the fiber Bragg gratings under the external temperature effects and the static pressure is described. The experiment has shown that reflection spectra displacement of Bragg gratings reduces the visibility of the interference pattern. A method of center wavelength adjustment is proposed for the optical radiation source in accord ance with the current Bragg gratings reflection spectra based on the impulse relative modulation of control signal for the Peltier element controller. The semiconductor vertical-cavity surface-emitting laser controlled by a pump driver is used as a light source. The method is implemented by the Peltier element controller regulating and stabilizing the light source temperature, and a programmable logic-integrated circuit monitoring the Peltier element controller. The experiment has proved that the proposed method rendered possible to regulate the light source temperature at a pitch of 0.05 K and adjust the optical radiation source center wavelength at a pitch of 0.05 nm. Experimental results have revealed that the central wavelength of the radiation adjustment at a pitch of 0.005 nm gives the possibility for the capacity of the array consisting of four opticalfiber sensors based on the fiber Bragg gratings. They are formed in one optical fiber under the Bragg grating temperature change from 0° C to 300° C and by the optical fiber mechanical stretching by the force up to 2 N.

Keywords: interferometric fiber-optic sensor, fiber Bragg grating, vertical-cavity surface-emitting laser.

Acknowledgements. This work was carried out in ITMO University under financial support by the Ministry of Education and Science of the Russian Federation (Project No 02.G25.31.0044).

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