| 摘要 |
PURPOSE:To provide an optical control device with the characteristic stable over a long term by reducing a DC drift which has been a problem in conventional optical control devices. CONSTITUTION:In an optical waveguide type optical control device constituted of optical waveguides 2, 3 provided in a dielectric crystal substrate 1 provided with an electrooptical effect, an optical buffer layer 6 provided on the substrate incorporating the optical waveguides 2, 3 and a control electrode 5 provided on the optical buffer layer 6 in the vicinity of the optical waveguides 2, 3, features of this device is that the product of a specific resistance in DC and a dielectric constant of the optical buffer layer 6 is smaller than that of the dielectric crystal substrate 1. |
