Reflected power-based 2D bending sensor using femtosecond laser FBG inscription in multicore fiber

Roldán Varona, Pablo; Pallarés Aldeiturriaga, David; Rodríguez Cobo, Luis; López Higuera, José Miguel

doi:10.1117/12.2538794

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ReflectedPowerBased.pdf (1.370Mb)

Identificadores

URI: http://hdl.handle.net/10902/18302

DOI: 10.1117/12.2538794

ISSN: 0277-786X

ISSN: 1996-756X

Fecha

2019-08-28

Derechos

© 2019 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Publicado en

Proceedings of SPIE, 2019, 11199, 111992M

Seventh European Workshop on Optical Fibre Sensors (EWOFS 2019), Limassol, Chipre, 2019

Editorial

SPIE Society of Photo-Optical Instrumentation Engineers

Enlace a la publicación

https://doi.org/10.1117/12.2538794

Palabras clave

Bending

Sensor

Femtosecond laser

Fiber Bragg grating

Multicore fiber

Resumen/Abstract

In this paper, we present research on the use of femtosecond lasers to develop a two-dimensional bending sensor by inscribing a 4 mm fiber Bragg grating (FBG) in each of the four cores of a multicore fiber (MCF) Fibercore SM-4C1500. The sensor located at the end of the fiber is spliced to a 50/125 multimode fiber (MMF). Due to the geometry of the MCF, part of its cores do not directly attach to the core of the multimode fiber, so that different curvatures cause variations in the reflected power. In this way, a reflection configuration and a commercial spectrometer are used to study its power response, simplifying the sensing, since it is not necessary to have WDM elements for the handling of wavelengths that vary tenths of nm in this type of sensors. Likewise, by carefully controlling the laser parameters and the motor stage position we are able to inscribe the FBGs by means of the point-by-point (PbP) method.