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Coupled-mode theory applied to reversed- Delta beta parallel directional coupler switches with tapered-sections input and output waveguide predicts a residual crosstalk in the straight through (bar) state due to coupling within the tapered regions which could be as low as 10-15 dB. Complete switching to the cross state, however, can be achieved assuming ideal conditions. Means of reducing the crosstalk in the bar state using phase control are presented.>
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Findakly et al. (1988) studied this question.
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