| 摘要 |
PURPOSE:To uniform the temperature distribution of the optical circuit element by providing a light shield layer in contact with at least electrodes on the substrate surface of the optical circuit element. CONSTITUTION:The optical circuit element which has an optical waveguide 2 and electrodes 3 formed on a substrate 1 is provided with the light shield material layer 4 of, for example, a black paint with high heat absorptivity. The light shield material layer 4 may be adhered on an electrode part, over the entire surface of the substrate, or to the reverse side of the substrate 1. When external heat is applied to this element, the light shield layer 4 becomes hot firstly. The metallic electrodes 3 have high heat conductivity, so the inside of the light shield material layer short-circuits thermall including the electrodes. Consequently, the temperature difference is eliminated and the external heat is relaxed. |
