Femtosecond laser direct written off-axis fiber Bragg gratings for sensing applications

dc.contributor.author Carlos Duarte Viveiros en
dc.contributor.author Vítor Oliveira Amorim en
dc.contributor.author João Miguel Maia en
dc.contributor.author Susana Oliveira Silva en
dc.contributor.author Orlando Frazão en
dc.contributor.author Pedro Jorge en
dc.contributor.author Fernandes,LA en
dc.contributor.author Paulo Vicente Marques en
dc.contributor.other 3565 en
dc.contributor.other 4061 en
dc.contributor.other 4287 en
dc.contributor.other 4678 en
dc.contributor.other 5872 en
dc.contributor.other 6407 en
dc.contributor.other 6596 en
dc.date.accessioned 2023-05-04T12:40:26Z
dc.date.available 2023-05-04T12:40:26Z
dc.date.issued 2020 en
dc.description.abstract First order off-axis fiber Bragg gratings (FBGs) were fabricated in a standard single mode fiber (SMF-28e) through femtosecond laser direct writing. A minimum offset distance between the grating and core center of 2.5 µm was found to create a multimode section, which supports two separate fiber modes (LP0,1 and LP1,1), each split into two degenerate polarization modes. The resulting structure breaks the cylindrical symmetry of the fiber, introducing birefringence (˜10-4) resulting in a polarization dependent Bragg wavelength for each mode. Based on the modal and birefringence behavior, three off-axis FBGs were fabricated with 3.0, 4.5 and 6.0 µm offsets from the core center, and then characterized in strain, temperature, and curvature. The tested off-axis FBGs exhibited a similar strain sensitivity of ~1.14 pm/µ? and a temperature sensitivity of ~12 pm/C. The curvature and orientation angle were simultaneously monitored by analyzing the intensity fluctuation and the wavelength shift of the LP1,1 Bragg resonance. A maximum curvature sensitivity of 0.53 dB/m-1 was obtained for the off-axis FBG with a 3.0 µm offset. © 2020 Elsevier Ltd en
dc.identifier P-00R-Y3W en
dc.identifier.uri http://dx.doi.org/10.1016/j.optlastec.2020.106227 en
dc.identifier.uri https://repositorio.inesctec.pt/handle/123456789/13740
dc.language eng en
dc.rights info:eu-repo/semantics/openAccess en
dc.title Femtosecond laser direct written off-axis fiber Bragg gratings for sensing applications en
dc.type en
dc.type Publication en
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