Photo-electric combined substrate

Abstract

The present invention provides a photo-electric combined substrate comprising an electric interconnection part having an electric interconnection layer and an electric insulating layer as well as an optical waveguide part consisting of a core and a clad, where the electric insulating layer in the electric interconnection part and the optical waveguide part are made of the same material; a ceramic substrate comprising an optical device and an electric device where a ceramic substrate has a concave where the concave is filled with a resin, and where at least an optical device is mounted on the ceramic substrate while an electric device on the resin in the substrate concave; and an optical waveguide comprising a core and a clad having a refractive index lower than that of the core, where the core is made of a fluorene-unit-containing epoxy acrylate resin.

What is claimed is:  
     
         1 . A ceramic substrate comprising an optical device and an electric device where a ceramic substrate has a concave where the concave is filled with a resin, and where at least an optical device is mounted on the ceramic substrate while an electric device on the resin in the substrate concave.  
     
     
         2 . The ceramic substrate comprising an optical device and electric device as claimed in  claim 1  where the ceramic substrate is a multilayer interconnection substrate.  
     
     
         3 . The ceramic substrate comprising an optical device and an electric device as claimed in  claim 1  where the surfaces of the resin filled in the concave and of the ceramic substrate are at the same level.  
     
     
         4 . The ceramic substrate comprising an optical device and an electric device as claimed in  claim 1  where a fine electric interconnection layer is formed on the concave using the resin filled in the concave as an electric insulating layer.  
     
     
         5 . The ceramic substrate comprising an optical device and an electric device as claimed in  claim 1  where the resin filled in the concave is cured in the concave.  
     
     
         6 . The ceramic substrate comprising an optical device and an electric device as claimed in  claim 1  where the resin filled in the concave is cured into the shape of the concave and then fitted into the concave.  
     
     
         7 . The ceramic substrate comprising an optical device and an electric device as claimed in  claim 1  where a material whose coefficient of thermal expansion is substantially equal to that of the material for the optical device is used as a main ceramic material for the ceramic substrate.