Sumitomo Osaka Cement Co., Ltd.

Teppei Yanagawa

Junichiro Ichikawa

Katsutoshi Kondou

Tetsuya Fujino

To effectively prevent the acceleration of the drift phenomenon generated by the application of a high electric field to a substrate through a bias electrode in a waveguide type optical element. A waveguide type optical element includes a substrate () having an electro-optic effect, two optical waveguides (and) disposed on a surface of the substrate, a non-conductive layer () which is disposed on the substrate and is made of a material having a lower dielectric constant than the substrate, and a control electrode () which is disposed on the non-conductive layer and is intended to generate a refractive index difference between the two optical waveguides by respectively applying electric fields to the two optical waveguides, and the non-conductive layer is constituted of a material which includes silicon oxide, an oxide of indium, and an oxide of titanium and has a ratio between a molar concentration of the titanium oxide and a molar concentration of indium oxide of 1.2 or more, and a voltage generating an electric field of 1 V/&#x3bc;m or more in the substrate is applied to the control electrode.

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Tokyo, Japan

Teppei Yanagawa