| 摘要 |
PROBLEM TO BE SOLVED: To freely switch an optical path between mutually crossing optical waveguides by making the center line of a groove with two opposing side walls coincide with the internal angle bisector at the intersection of the optical axis center lines of the crossing waveguides. SOLUTION: Optical waveguides 1 cross each other and, at the intersection, a groove 2 is provided having two opposing side walls vertical to the optical waveguides 1. In the groove 2, an index matching liquid 3 is partially sealed such as silicone oil having the same refractive index as that of the core of the optical waveguides 1. With the center line of the groove 2 provided so as to coincide with the internal bisector (ideal reflecting surface 4) at the intersection of the optical waveguides 1, the position of the side walls of the groove 2 is found shifted from the ideal reflection surface 4 by half the width of the groove 2. However, through the Goos-Hanchen effect, the actual reflection surface shifts from the side wall of the groove 2 to the ideal reflection surface 4. Hence, by using this shift, the reflection surface can be set at the position close to the ideal reflection surface 4. |
