Patent ID: 7925123
Filing Date: 2011-04-12
Classification: G02F

Abstract:
1. An optical control device, comprising: a sheet-like substrate which has an electro-optical effect and has a thickness of 10 μm or less; an optical waveguide formed on the sheet-like substrate; and a control electrode for controlling light passing through the optical waveguide, wherein the control electrode is comprised of a first electrode and a second electrode which are arranged so as to interpose the sheet-like substrate so that the first electrode includes a coplanar electrode which is composed of at least a signal electrode and a ground electrode and the second electrode is configured to include at least a ground electrode so that an electric field is applied to the optical waveguide by the signal electrode of the first electrode and the ground electrode of the second electrode; wherein a low dielectric constant layer, which has a width at least larger than that of the signal electrode of the first electrode and is formed at least over an entire length of the signal electrode, is formed between the sheet-like substrate and the second electrode; and wherein a relation of d