| 摘要 |
An optical switching/modulation device (1) comprises a substrate (2) made from lithium niobate, a first, a second and a third waveguide (3-5) for the light, formed on the substrate and forming a Y structure, a central electrode (6) lying between the second and third waveguide (4, 5) and a pair of outer electrodes (7, 8) adjacent to the second and third waveguide (4, 5) respectively on opposite sides from the central electrode (6); the waveguides (3-5) are connected by means of a connecting waveguide (10) having a longitudinal axis (9) and including a multimodal transmission region (14); the central electrode (6) has a longitudinal extension (6b) extending within the multimodal region (14) and having an end (6c) terminating within the multimodal region (14), in such a way that a particularly high value of the extinction ratio of the device can be provided. |
