Sumitomo Cement Co., Ltd.

Hideki Honda

Manabu Yamada

Junichiro Ichikawa

Toshihiro Sakamoto

Hirotoshi Nagata

Takashi Shinriki

Shinichi Shimotsu

Junichiro Minowa

Jamshid Nayyer

Masanobu Kobayashi

Kazumasa Kiuchi

Junichi Ogiwara

An optical waveguide device usable as an optical wave-modulator and having a reduced DC drift includes a LiNbO.sub.3 substrate, an optical waveguide formed in a front surface portion of the substrate, a dielectric layer covering the front surface of the substrate and the optical waveguide surface, and an electrode system arranged on the dielectric layer, the dielectric layer comprising a matrix component consisting of an amorphous SiO.sub.2 and a doping element component consisting of Li and/or Nb; and having a refractive index lower than that of the amorphous SiO.sub.2 matrix free from the doping element component.

Optical waveguide modulator having a reduced D.C. drift

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Funabashi, Japan

Hideki Honda