| 摘要 |
<p><P>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 microwave, reducing the drive voltage and capable of achieving impedance matching between a signal line, such as a coaxial cable introducing the microwaves into an optical modulator and a control electrode in the optical modulator. <P>SOLUTION: In the optical control device having a thin plate having electro-optical effects and 10μm or smaller thickness, an optical waveguide formed on the thin plate and a control electrode for controlling light passing through the optical waveguide, the control electrode comprises first and second electrodes 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 cooperatively with the signal electrode of the first electrode in a modulation region part and is configured so as to have no electrode, at least at a lower part of the signal electrode of the first electrode in a signal input/output part. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
