| 摘要 |
An optical device 1 has a photodetecting element 6 , an optical waveguide layer 4 containing core portions 4 a to 4 c extending in directions crossing a layer thickness direction and a clad portion 4 h covering the core portions 4 a to 4 c, and an optical waveguide substrate 2 having the end face 4 g of the core portion 4 c optically coupled to the photodetecting element 6 on the side surface 2 a thereof. The optical waveguide substrate 2 has substrates 3 and 5 disposed so that the principal surfaces 3 a and 5 a face each other. The optical waveguide layer 4 is provided between the substrate 3 and the substrate 5 . The photodetecting element 6 is mounted on the mount area 2 c on the side surface 2 a of the optical waveguide substrate 2 . The mount area 2 c is set to contain the end face 4 g of the core portion 4 c, a part of the side surface 3 b of the substrate 73 and a part of the side surface 5 b of the substrate 5 . Accordingly, in the optical device, the optical coupling efficiency between a semiconductor optical element such as a light emission element and a photodetecting element and an optical waveguide can be enhanced.
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