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A directional-coupler power divider by two-step K(+)-ion exchange is proposed and investigated experimentally after some preliminary design calculations. Coupling has been achieved with significant dimensional relaxation. Measurements were also made on the power-dividing and the extinction ratios. With a thin dielectric cladding over the coupling region, a fine tuning is feasible.
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Yip et al. (1984) studied this question.
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