(Elsevier, 2018) Gallego Martínez, Elieser Ernesto; Ascorbe Muruzabal, Joaquín; Del Villar, Ignacio; Corres Sanz, Jesús María; Matías Maestro, Ignacio; Ingeniaritza Elektrikoa eta Elektronikoa; Institute of Smart Cities - ISC; Ingeniería Eléctrica y Electrónica
This work describes the process of nanofabrication of phase-shifted Bragg gratings on the end facet of a
multimode optical fiber with a pulsed DC sputtering system based on a single target. Several structures
have been explored as a function of parameters such as the number of layers or the phase-shift. The
experimental results, corroborated with simulations based on plane-wave propagation in a stack of
homogeneous layers, indicate that the phase-shift can be controlled with a high degree of accuracy.
The device could be used both in communications, as a filter, or in the sensors domain. As an example
of application, a humidity sensor with wavelength shifts of 12 nm in the range of 30 to 90% relative
humidity (200 pm/% relative humidity) is presented.
