Patent ID: 6974714

Claim:
A process for making a light waveguide element mounted on a mount board along with an optical fiber and photoelectric components, comprises: forming a core as a light path on a substrate serving as a lower clad layer; and forming a T-shaped upper clad layer having a central section elevated from optical axis height-adjusting side sections to cover said core, wherein said T-shaped upper clad layer-forming step comprises: patterning, subsequent to said core-forming step, an etching stopper film on opposite sides of said core including an area of said optical axis height-adjusting side sections; forming a first upper clad layer over an entire surface including said etching stopper film, said core, and said substrate; forming an etching mask on said first upper clad layer so as to cover an area above said core; etching off a portion of said first upper clad layer that is other than said area covered by said etching mask until said etching stopper film is exposed; removing said etching stopper film and said etching mask; and forming a second upper clad layer over an entire surface including said first upper clad layer and said substrate.