Advances in OptoElectronics
Volume 2008 (2008), Article ID 654280, 4 pages
doi:10.1155/2008/654280
Research Article

Fabrication of Proton-Exchange Waveguide Using Stoichiometric LiTaO3 for Guided Wave Electrooptic Modulators with Polarization-Reversed Structure

Hiroshi Murata and Yasuyuki Okamura

Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Received 2 July 2008; Accepted 2 September 2008

Academic Editor: Chang-qing Xu

Copyright © 2008 Hiroshi Murata and Yasuyuki Okamura. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Optical waveguides were fabricated on z-cut stoichiometric LiTaO3 (SLT) by using the proton-exchange method. The surface index change for the extraordinary ray on the SLT substrate resulting from the proton exchange was 0.017, which coincided well with congruent LiTaO3 substrates. The proton exchange coefficient in the SLT was 0.25×10−12 cm2/s. The application of the SLT waveguide to a quasi-velocity-matched travelling-wave electrooptic modulator with periodically polarization-reversed structure is also reported.