| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical control element capable of achieving speed maching between a microwave and a light wave and impedance matching of the microwave and reducing a driving voltage. SOLUTION: The optical control element has a thin plate 1 of≤10μm in thickness having electrooptic effect, an optical waveguide 2 formed on the thin film, and a control electrode for controlling light passing through the optical waveguide, wherein the control electrode comprises a first electrode and a second electrode disposed across the thin plate, the first electrode having a coplanar type electrode comprising at least a signal electrode 4 and a ground electrode 5 (51) and the second electrode having at least a ground electrode 54 and configured to apply an electric field to the optical waveguide cooperatively with the signal electrode of the first electrode, and the signal electrode of the first electrode has≥2 branch signal lines branching halfway from at least one signal line. COPYRIGHT: (C)2008,JPO&INPIT
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