Being the electric optical guided wave path component and that production mannered null electric optical guided wave path component of the bias dot direct current

摘要

PROBLEM TO BE SOLVED: To provide a lithium niobate type electrooptical optical waveguide element of the configuration in which the drift due to a DC voltage at a bias point and a temperature drift are suppressed, for example, a modulator.;SOLUTION: An optical waveguide is disposed on the surface within an electrooptical substrate or near the same and a buffer layer is formed on the surface of the substrate. A block layer which is a novel element with this kind of the element is formed on the surface of the buffer layer and functions to suppress or reduce the occurrence of an unnecessary chemical reaction on the surface or near the same. The electric charges generated on the surface section of the element or within the same propagate in a desired direction in a charge dissipation layer which is disposed on the block layer and has moderate electric conduction. A plurality of the electrodes disposed on the surface of the charge dissipation layer sends an electric signal through the respective layers of buffer, block and charge dissipation to the optical waveguide.;COPYRIGHT: (C)2007,JPO&INPIT