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Low-loss electrooptic BaTiO3 thin film waveguide modulator

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4 Author(s)
Tang, P. ; Dept. of Mater. Sci., Northwestern Univ., Evanston, IL, USA ; Towner, D.J. ; Meier, A.L. ; Wessels, B.W.

A strip-loaded electrooptic waveguide modulator based on an epitaxial BaTiO3 thin film was fabricated and characterized for the first time. The strip-loaded waveguide structure greatly improves waveguide propagation and polarization-dependent loss performance. A propagation loss of 1.1 dB/cm and polarization dependent loss of 0.1 dB/cm were measured. The electrooptic waveguide modulator exhibited a half-wave voltage-interaction length product of 4.5 V · cm at a wavelength of 1542 nm. The measured effective electrooptic coefficient of the as-grown BaTiO3 waveguide modulator was 38 pm/V. The experimental results indicate that a strip-loaded thin film waveguide modulator is suitable for photonic applications.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 8 )

Date of Publication:

Aug. 2004

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