title: Control of light transmission in laser-written phase-shifted Bragg grating couplers.
abstract: We demonstrate the fabrication by direct laser writing and the operation of a directional coupler containing Bragg gratings in each waveguide. We achieve high-precision control over the longitudinal shift between the gratings, which feature first-order Bragg resonance at telecommunication wavelengths. We observe fundamental differences between light transmission characteristics in couplers with unshifted and shifted gratings in agreement with theoretical predictions.
authors.affiliation: Nonlinear Physics Centre and Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.
authors.forename: Sangwoo
authors.initials: S
authors.lastname: Ha
authors.forename: Martin
authors.initials: M
authors.lastname: Ams
authors.forename: Graham D
authors.initials: GD
authors.lastname: Marshall
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Sukhorukov
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Withford