| 摘要 |
A digital optical switch includes an input waveguide connected to a Y-shaped branching waveguide having two legs, each of the legs being connected to an outp ut waveguide. Each output waveguide forms one waveguide of a directional coupler, the other waveguide of which has its output dissipated into the substrate. Elect rodes are connected to voltage sources such that the switch is operative between two states. In the first state, transmission of optical energy is enhanced between t he input waveguide and the first output waveguide and inhibited between the input wavegui de and the second output waveguide. Coupling between the first output waveguide and the other waveguide of its respective directional coupler is inhibited and coupl ing between the second output waveguide and the other waveguide of its respective directional coupler is enhanced. In the second state, transmission of optical en ergy is inhibited between the input waveguide and the first output waveguide and enhance d between the input waveguide and the second output waveguide. Coupling between the first output waveguide and the other waveguide of its respective directional coupler is enhanced and coupling between the second output waveguide and the other waveguide of its respective directional coupler is inhibited.
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