Abstract
We propose a tapered electrode structure to make the ratio of the coupling coefficient to the difference of propagation constants between two coupled waveguides in a directional coupler switch a constant throughout it. In this way, the crosstalk caused by the existence of tapered sections is entirely eliminated.
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Li, D. Elimination of crosstalk in directional coupler switches. Optical and Quantum Electronics 25, 255–260 (1993). https://doi.org/10.1007/BF00419002
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DOI: https://doi.org/10.1007/BF00419002