| 摘要 |
<p>A the end of a waveguide (6) to which a light-emitting element (2) is optically coupled, is provided a spot-size conversion region (12) configured by reducing a width or a thickness of the waveguide, or both thereof all the more in the light-emitting element (2) side, and at the end of a waveguide (7) to which an photoreceptive element (9) is optically coupled is provided a spot-size conversion region (13) configured by increasing a width or a thickness of the waveguide, or both thereof all the more in the photoreceptive element (9) side. <IMAGE></p> |
