Patent ID: 7149389

Claim:
An optical printed circuit board system comprising: a substrate as a printed circuit board having an electrical circuit and on which an electrical circuit chip is mounted; a system board comprising an optical bench coupled to the substrate an on which a photoelectrical signal chip electrically connected to the electrical circuit chip through the electrical circuit, an optical device electrically connected to the photoelectrical signal chip, and a first optical waveguide aligned to the optical device for optical coupling and tapered in a first direction parallel to the substrate to have a smaller aperture in an output node for outputting the optical signals smaller than that in an input node for inputting the optical signals are mounted; and a back plane comprising a groove into which the system board is inserted and a second optical waveguide optically coupled to the first optical waveguide and tapered in a second direction parallel to the back plane to have a smaller aperture in the output node than in the input node, wherein the input node of the first optical waveguide is optically coupled to the output node of the second optical waveguide or the output node of the first optical waveguide is optically coupled to the input node of the second optical waveguide.