title: Coupling between counterpropagating cladding modes in fiber Bragg gratings.
abstract: We present an experimental demonstration of energy transfer between counterpropagating cladding modes in a fiber Bragg grating (FBG). A strong FBG written in a standard photosensitive optical fiber is illuminated with a single cladding mode, and the power transferred between the forward propagating cladding mode and different backward propagating cladding modes is measured by using two auxiliary long period gratings. Resonances between cladding modes having 30 pm bandwidth and 8 dB rejection have been observed.
authors.affiliation: Department of Applied Physics and Electromagnetism, University of Valencia, Dr. Moliner 50, Burjassot 46100, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Sáez-Rodriguez
authors.forename: J L
authors.initials: JL
authors.lastname: Cruz
authors.forename: A
authors.initials: A
authors.lastname: Díez
authors.forename: M V
authors.initials: MV
authors.lastname: Andrés