title: Tilted fiber Bragg gratings in multicore optical fibers for optical sensing.
abstract: We have inscribed a tilted fiber Bragg grating (TFBG) in selected cores of a multicore optical fiber. The presence of the TFBG permits to couple light from the incident-guided mode to the cladding modes and to the neighbor cores, and this interaction can be used for optical sensing. We measured different magnitudes: strain, curvature magnitude and direction, and external refractive index. The curvature results show a linear dependence of the maximum crosstalk with the curvature magnitude with a sensitivity of 2.5  dB/m-1as the curvature magnitude increases and at the same time a wavelength shift of 70  pm/m-1. Changes in the external refractive index gradually vanish the cladding modes resonances and the crosstalk between the different cores, obtaining a reduction of the 90% of the optical spectra integral area for refractive indexes between 1.398 and 1.474.
authors.forename: David
authors.initials: D
authors.lastname: Barrera
authors.forename: Javier
authors.initials: J
authors.lastname: Madrigal
authors.forename: Salvador
authors.initials: S
authors.lastname: Sales