| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light input/output structure for multilayer optical wiring that achieves efficient optical coupling at a diffraction grating of each layer by radiating and diffracting light with a homogeneous phase without need of individually preparing an optical coupling structure for each layer and separately preparing an optical circuit for branching light from an optical coupling structure to each layer. <P>SOLUTION: In the light input/output structure for multilayer optical wiring, a plurality of diffraction grating couplers 1-1 and 1-2 for diffracting a light beam 10 incident to a substrate from a vertical direction X1 into a substrate in-plane direction are laminated in multistage in a thickness direction X1 of the substrate. A plurality of wave guides are prepared for guiding the light diffracted by the plurality of diffraction grating couplers 1-1 and 1-2 to each layer optical circuit. Optical path lengths 1-1 and 1-2 of diffraction grating couplers in adjacent layers are equivalent to n<SB POS="POST">1</SB>λ<SB POS="POST">1</SB>/2 (here, λ<SB POS="POST">1</SB>is a wavelength in vacuum of light that is guided to an upper layer optical circuit, and n<SB POS="POST">1</SB>is a natural number). <P>COPYRIGHT: (C)2012,JPO&INPIT |
