Patent ID: 9081214
Filing Date: 2015-07-14
Classification: G02F

Abstract:
1. An optical control element comprising: a substrate having an electro-optical effect; optical waveguides formed on the substrate; and a control electrode that controls light waves propagating through the optical waveguides, wherein the optical waveguides comprise an output waveguide portion which derives fundamental mode light, and a subsidiary waveguide portion which is connected to the output waveguide portion and derives higher mode light; removal means are formed in contact with the subsidiary waveguide portion, for removing the higher mode light propagating through the subsidiary waveguide portion; and a waveguide width on an incidence side of the subsidiary waveguide portion is smaller than a width of the output waveguide portion, and a width of the subsidiary waveguide portion is larger than the width of the output waveguide portion in a region where the subsidiary waveguide portion is in contact with the removal means.