Patent ID: 7142739

Claim:
A photoelectronic device, comprising: a light emitting element for emitting a light to be a clock signal; a semiconductor chip provided with light receiving portions for receiving said light; and an optical waveguide sheet formed to be a sheet, wherein an outer circumference of a core is covered with a clad, and adhered to said semiconductor chip; wherein said optical waveguide sheet is irradiated at a light incident portion of said core with said light from said light emitting element; said optical waveguide sheet is provided with one or more T-shaped branch, and at each T-shaped branch is provided with a vertical opening portion having a vertical inner wall being vertical with respect to the direction within a surface of said optical waveguide sheet, and said vertical inner wall serves as a mirror surface for dividing, reflecting and guiding said light to two different directions; and a sloping opening portion having a sloping inner wall having an inclination with the optical waveguide direction of said core is provided at a position of connecting each of said divided lights to each of said light receiving portions, and said sloping inner wall serves as a mirror surface for reflecting said light to the direction being out of the surface of said optical waveguide sheet to be connected to said light receiving portion.