title: Electrooptic modulation up to 40 GHz in a barium titanate thin film waveguide modulator.
abstract: The high frequency operation of a low-voltage electrooptic modulator based on a strip-loaded BaTiO3 thin film waveguide structure has been demonstrated. The epitaxial BaTiO3 thin film on an MgO substrate forms a composite structure with a low effective dielectric constant of 20.8 at 40 GHz. A 3.9 V half-wave voltage with a 3.7 GHz 3-dB bandwidth and a 150 pm/V effective electrooptic coefficient is obtained for the 3.2mm-long modulator at 1.55 ?m. Broadband modulation up to 40 GHz is measured with a calibrated detection system. Numerical simulations indicate that the BaTiO3 thin film modulator has the potential for a 3-dB operational bandwidth in excess of 40 GHz through optimized design.
authors.forename: Pingsheng
authors.initials: P
authors.lastname: Tang
authors.forename: D
authors.initials: D
authors.lastname: Towner
authors.forename: T
authors.initials: T
authors.lastname: Hamano
authors.forename: A
authors.initials: A
authors.lastname: Meier
authors.forename: B
authors.initials: B
authors.lastname: Wessels