Two-dimensional vector bending sensor based on Fabry-Perot cavities in a multicore fiber

In this work we demonstrate the fabrication and characterization of a temperature insensitive, two-dimensional curvature sensor using a resin based Fabry-Perot interferometer, constructed using a multicore fiber (MCF). The fabrication simplicity makes this fiber device very attractive compared to the already reported technologies. Furthermore, the sensitivity reached (>400 pm/m(-1)), 7 times higher than the one reported for fiber Bragg gratings written on a similar MCF. The reconstruction of the amplitude and curvature has been performed for, showing errors lower than 4%. A numerical study has also been developed, allowing us to understand the sensor response at different fiber sensor geometries. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

This work demonstrates the fabrication and characterization of a temperature insensitive, two-dimensional curvature sensor using a resin based Fabry-Perot interferometer constructed with a multicore fiber (MCF). The sensor shows high sensitivity and accuracy in measuring curvature under different geometries.