| 摘要 |
PURPOSE:To reduce the optical coupling loss by making the width or/and the thickness of optical waveguides in the vicinity of an intersection smaller than those in the other parts. CONSTITUTION:The width of an intersection 14 is made narrower than width W0 of waveguides in the other parts, and parts on the intersection 14 side of optical waveguides 11, 12, and 13 connected to the intersection 14 are formed into taper parts 11a, 12a, and 13a where the width of waveguides is gradually reduced toward the intersection 14. Therefore, the gap D1 of the intersection 14 becomes fairly small. When this cross optical waveguide is actually produced, the width of each of taper parts 11a, 12a, and 13a of optical waveguides 11, 12, and 13 is changed from W0, to W', and waveguide width W' and gap D' of an actual intersection 14A are shorter than the conventional waveguide width. |
