title: Fast and slow light in optical fibers through tilted fiber Bragg gratings.
abstract: In this paper, slow and fast light in optical fiber through tilted fiber Bragg grating (TFBG) are reported. The experimental results show the capability of TFBGs to enable group velocity control of an optical pulse in optical fiber, due to the anomalous dispersion features induced by the coupling between the propagating core mode and each counter-propagating coupling cladding mode. In particular, superluminal propagation of a pulse train has been observed at optical communication wavelengths with time advancements in the picoseconds time scale in 1cm long TFBG and group velocity as large as about two times the speed of light in optical fiber (approximately 1.3 x c0). Very good agreement has been obtained comparing the measured group delay of the TFBG with the one retrieved from the amplitude response through Hilbert transform. Finally, tunable slow and fast light has also been reported, demonstrating the possibility to control the group velocity at single wavelength through both fluidic and thermal actuation.
authors.affiliation: Optoelectronics Division-Engineering Department, University of Sannio, Corso Garibaldi 107, 82100 Benevento, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Pisco
authors.forename: Armando
authors.initials: A
authors.lastname: Ricciardi
authors.forename: Stefania
authors.initials: S
authors.lastname: Campopiano
authors.forename: Christophe
authors.initials: C
authors.lastname: Caucheteur
authors.forename: Patrice
authors.initials: P
authors.lastname: Mégret
authors.forename: Antonello
authors.initials: A
authors.lastname: Cutolo
authors.forename: Andrea
authors.initials: A
authors.lastname: Cusano
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D055100:Optical Fibers; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation