THREE-DIMENSIONAL OPTICAL CIRCUIT

摘要

PURPOSE:To make integration for about two substrates with one substrate by forming optical waveguides on both front and rear surfaces of the substrate and forming an optical coupling element which emits light toward the other surface to the optical waveguide on one surface and an optical coupling element which makes incident the light from one surface on the optical waveguide of said surface to the optical waveguide of the other surface. CONSTITUTION:The light outputted from a light emitting element 11 is conducted to the optical waveguide 12 by which the light is branched to two beams of light. The branched beams of light advance to the optical waveguides 13 and 14. The light 14 advancing to the waveguide 14 is subjected to prescribed processing by an optical processing part 15 provided in the mid-way of the waveguide 14. A grating 17 is formed to the terminal end of the waveguide 13. The light advancing to the waveguide 13 is emitted from the grating 17 into the substrate 10 toward the bottom surface of the substrate 10. The light is conducted from the grating 28 to the optical waveguide 22 and is detected by a photodetector 29.