| 摘要 |
PURPOSE:To obtain an optical switch which simultaneously satisfies low driving voltage and low loss by projecting the surface area of a 1st substrate and making the projected part at least 0.1mum higher than the surfaces of two optical wave guides. CONSTITUTION:The title switch is constituted by using a directional coupler and has such a structure that only an area which forms an electrode between two nearby optical wave guides makes an LiNbO3 projecting part. When the waveguide light is shifted from an optical wave guide 4a to an optical wave guide 4b, or when the waveguide light is shifted from the optical wave guide 4b to the optical wave guide 4a, the waveguide light passes under an electrode 6a formed between the optical wave guides 4a and 4b. Since the electrode 6a is formed on the LiNbO3 projecting part 3, the LiNbO3 projecting part 3 forms a buffer layer. And the projecting part is made at least 0.1mum higher than the surfaces of both optical wave guides 4a and 4b. Thus, the optical switch where the driving voltage is low and the loss is small can be obtained. |
