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Ferroelectic BaTiO3 Thin Film Optical Waveguide Modulators

  • A. Petraru (a1), M. Siegert (a1), M. Schmid (a1), J. Schubert (a1) and Ch. Buchal (a2)...

Abstract

High quality BaTiO3 epitaxial thin films on MgO substrates have been grown by pulsed laser deposition (PLD). Both c-axis and a-axis orientated BaTiO3 were studied. Mach-Zehnder (M-Z) optical waveguide modulators have been fabricated by ion beam etching. The BaTiO3 waveguide propagation losses are 1-2 dB/cm. Electro-optic modulation has been demonstrated with Vπ = 6.3 V at a wavelength of 633 nm and Vπ = 9.5 V at a wavelength of 1550 nm for the aaxis samples and with Vπ = 8 V at 633 nm wavelength and Vπ = 15 V at 1550 nm for the c-axis samples. Modelling of the modulators gave the Pockels coefficient r51 = 80 pm/V for the c-axis film and an effective Pockels coefficient reff =734pm/V for the a-axis films at 633nm wavelength.

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Ferroelectic BaTiO3 Thin Film Optical Waveguide Modulators

  • A. Petraru (a1), M. Siegert (a1), M. Schmid (a1), J. Schubert (a1) and Ch. Buchal (a2)...

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