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Operation and design considerations are described for a general class of symmetric directional coupler switches. Performance limitations are discussed in terms of asymmetries. Comparisons are made between various waveguide and electrode geometries. Measured devices operating atλ = 0.83 have a Vπvoltage length product under 30 V mm and an extinction ratio greater than 28 dB in each output state.
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Forber et al. (1986) studied this question.
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