Publications

Publications by Carlos Duarte Viveiros

2020

Femtosecond Laser Direct Writing of Turn Around Point Long Period Fiber Gratings Coated with Titanium Dioxide for Improved Sensitivity

Authors
Viveiros, D; De Almeida, JMMM; Coelho, L; Vasconcelos, H; Maia, JM; Amorim, VA; Jorge, PAS; Marques, PVS;

Publication
Optics InfoBase Conference Papers

Abstract
The fabrication of Turn Around Point Long Period Fiber Grating in standard SMF-28e fibers through femtosecond laser direct writing is demonstrated and its sensing sensitivity is improved by coating the fiber with titanium dioxide through physical vapor deposition. © 2021 The Author(s).

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2020

Off-axis Fiber Bragg Grating Fabricated by Femtosecond Laser Direct Writing for Torsion Sensing

Authors
Viveiros, D; De Almeida, JMMM; Coelho, L; Maia, JM; Amorim, VA; Jorge, PAS; Marques, PVS;

Publication
Optics InfoBase Conference Papers

Abstract
The precise production of 4.5 µm off-axis first order FBG in an SMF-28e fiber through femtosecond laser direct writing is demonstrated. The off-axis FBG potential as sensing head for torsion sensing was successfully explored. © 2021 The Author(s).

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2020

Characterization of Femtosecond Laser Direct Written Mach-Zehnder Interferometers Based on Titanium Dioxide Coated Long Period Fiber Gratings

Authors
Viveiros, D; Vasconcelos, H; De Almeida, JMMM; Coelho, L; Amorim, VA; Maia, JM; Jorge, PAS; Marques, PVS;

Publication
Optics InfoBase Conference Papers

Abstract
Optical fiber Mach-Zehnder interferometers were fabricated by combining two TiO2 coated LPFGs fabricated through femtosecond laser direct writing. Results of its refractometric characterization are presented and compared with the single LPFGs sensors. Wavelength sensitivity of 1175 nm/RIU at 1.38 and spectral resolution of 2.2×10-5 were achieved. © 2021 The Author(s).

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