| 摘要 |
PURPOSE:To obtain an optical coupler which can be easily manufactured and has a high efficiency, by providing a collimating lens on a thin film waveguide, and providing a convex lens on an incident/emitting end face, so that a diffraction grating shape consists of a linear group for easily manufacturing a photomask. CONSTITUTION:A collimating lens 8 and a diffraction grating 3 consisting of a linear group are provided on the surface of an optical waveguide layer, the diffracted light by the diffraction grating 3 is inputted and outputted to and from the surface being different from the surface for contacting a thin film waveguide layer 2 of a substrate 1, and a diffracted light input/output surface is an end face of the substrate 1, and has a convex lens on its surface. The light beams which have been collimated by the lens 8 are diffracted to the substrate side by a diffraction grating 7 consisting of a linear group. The light beams which have been diffracted to the substrate side reach an incident/ emitting end face 11, and form an image in a focus 6 by a lens 9 which has been provided on the incident/emitting end face 11. |
