title: Bandwidth control in a hybrid fiber acousto-optic filter.
abstract: We report a bandwidth variation technique in an acousto-optic filter. Utilizing the adiabatic conversion in both optical and acoustic modes, we obtain a novel hybrid waveguide composed of serial concatenation of single-mode fiber (SMF) and two-mode hollow optical fiber (HOF). On the basis of dissimilarity in the phase-matching conditions and beat-length dispersion in SMF and HOF, the FWHM of the resonant bands is varied from 3.8 to 190 nm near the 1.5-microm region in a single device. Furthermore, we theoretically analyze the acousto-optic coupling among the guided modes in HOF, which shows good agreement with experimental observations.
authors.affiliation: Department of Information and Communications, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea.
authors.forename: Y
authors.initials: Y
authors.lastname: Jung
authors.forename: S B
authors.initials: SB
authors.lastname: Lee
authors.forename: Jhang W
authors.initials: JW
authors.lastname: Lee
authors.forename: K
authors.initials: K
authors.lastname: Oh