| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical control device capable of realizing speed matching between microwaves and light waves, and impedance matching of the microwaves, and moreover, is capable of reducing the drive voltage. SOLUTION: In the optical control device having a thin plate having an electrooptical effect and 10μm or smaller thickness, an optical waveguide formed on the thin plate and a control electrode for controlling the light passing through the optical waveguide, the control electrode comprises a first electrode and a second electrode disposed across the thin plate; the first electrode has a coplanar type electrode comprising at least a signal electrode and a ground electrode; and the second electrode has at least a ground electrode and is configured to apply an electric field to the optical waveguide in cooperation with the signal electrode of the first electrode. A low refractive index layer, having a width wider than the width of at least the signal electrode of the first electrode and provided over the entire length direction of at least the signal electrode, is formed at the lower part of the thin plate. COPYRIGHT: (C)2009,JPO&INPIT
|
