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We report the fabrication and testing of a GaAs electro-optic directional-coupler (EDC) switch in which the fraction of light coupled from one waveguide channel to the other can be controlled by an applied electric field. Ninety-five percent amplitude switching and a maximum extinction ratio of 13 dB have been observed in an EDC switch, having a minimum 3-dB bandwidth of ≳100 MHz and a drive power per unit bandwidth of <180 μW/MHz.
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Campbell et al. (1975) studied this question.
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