title: In-fiber Fabry-Perot refractometer assisted by a long-period grating.
abstract: We present an optical fiber refractometer based on a Fabry-Perot interferometer defined by two fiber Bragg gratings and an intracavity long-period grating that makes the light confined in the resonator interact with the surrounding medium. The external refractive index is monitored by the resonant frequencies of the Fabry-Perot interferometer, which can be measured either in transmission or in reflection. In this first experiment, wavelength shifts measured with a resolution of 0.1 pm have allowed one to establish a refractive index detection limit of 2.1x10(-5).
authors.affiliation: Facultad de Ingeniería Civil, Universidad Nacional de Ingeniería, Avenida Tupac Amaru 210, El Rimac,PE-Lima 025 Lima, Peru.
authors.forename: L
authors.initials: L
authors.lastname: Mosquera
authors.forename: D
authors.initials: D
authors.lastname: Sáez-Rodriguez
authors.forename: J L
authors.initials: JL
authors.lastname: Cruz
authors.forename: M V
authors.initials: MV
authors.lastname: Andrés