| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical connecting structure which is strong to disturbance and is small in size and low in cost by providing one substrate with diffraction grating type lenses and waveguide and introducing the light made incident through these diffraction grating type lenses to the optical waveguide via reflectors. SOLUTION: An input section is composed of the diffraction grating type lenses 7 existing on the rear surface of the substrate 1, the reflectors 9 formed by utilizing the diagonally etched window existing on the front surface of the substrate 1 and the optical waveguide 3. An output section 8 has the constitution similar to the constitution of the input section. Diffracted light 6 having the effect equal to the effect of the lenses is generated when the perpendicularly incident spatial parallel beams (a beam diameter sufficiently larger than the section of the waveguide) 5 from the outside are made incident on the diffraction grating type lenses 7. The diffracted light 6 propagates in the optical waveguide substrate 1. The diffracted light 6 focuses on the reflection metallic film 2 of the reflectors 9 existing at the ends of the optical waveguides 3. As a result, the diffracted light 6 reflects in the propagation direction of the waveguide and is changed in the optical path, by which the diffracted light is made into the guided light 4 propagating in the optical waveguide 3. |
