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Abstract

An optical modulator includes an optical waveguide, a first electrode, a second electrode, and a low dielectric constant layer. The optical waveguide is made of a material having an electro-optic effect. The first and second electrodes generate a potential difference with each other. In a cross-sectional view in a direction perpendicular or substantially perpendicular to an extending direction of the optical waveguide, the first electrode is on first side of the optical waveguide in a width direction and on first side of the optical waveguide in a thickness direction, the second electrode is on the second side of the optical waveguide in the width direction and on the second side of the optical waveguide in the thickness direction, the low dielectric constant layer is interposed between the first electrode and the optical waveguide, and a portion of the first electrode adjacent to the optical waveguide is in the low dielectric constant layer.

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