| 摘要 |
A 1x2 integrated optical switch with a high extinction ratio is obtained from the monolithic integration of three integrated waveguide couplers. The waveguide couplers are designed such that the output of the first waveguide coupler is directly coupled to the input of the other two integrated waveguide couplers by an integrated waveguide. Thus, the switch has two cascaded integrated waveguide couplers along each path from the single input to each of the two outputs. Only two pairs of electrodes are required by this design. The extinction ratio of this switch is the sum of the extinction ratios along an input-output path. Since integrated waveguide couplers are bidirectional, this switch can be used as a 2x1 switch by reversing the input and outputs.
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