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Bragg gratings and Fabry-Perot interferometers on an Er-MgO-doped optical fiber

Paixão, T. ; Pereira, L. ; MIN, R. ; MOLARDI, C. ; Blanc, W. B. ; Tosi, D. ; Marques, C. ; Antunes, P.

Optics and Laser Technology Vol. 123, Nº , pp. 105946 - 105946, March, 2020.

ISSN (print): 0030-3992
ISSN (online):

Journal Impact Factor: 1,647 (in 2014)

Digital Object Identifier: 10.1016/j.optlastec.2019.105946

Abstract
In this paper, the fabrication of fiber Bragg gratings (FBGs) and intrinsic Fabry-Pérot interferometers (IFPIs) on an Er-MgO-doped silica optical fiber is reported. The inscription of both sensing devices was performed by means of a femtosecond laser, using the phase mask method to inscribe the FBG and a micromachining platform for the IFPI. Thermal and strain characterizations were performed for both devices, achieving the maximum sensitivities of 12.57 pm/°C and 0.85 pm/µε for the FBG case, and 10.2 pm/°C and 0.91 pm/µε for the IFPI. A high temperature experiment was conducted to assess the thermal behavior of the inscribed FBG, revealing sensing capabilities for temperatures up to 700 °C. The results confirm that this new type of fiber will have an important role on the development of new optoelectronic devices, such as fiber lasers, optical amplifiers and sensors.