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A proper choice of material constants and waveguide structure is discussed to build a high-efficiency light intensity modulator using guided-to-radiation mode coupling through the electrooptic effect. The preferred structure is a 2-D light waveguide such as a LiNbO(3) thin film deposited on a LiTaO(3) substrate, with two planar modulation electrodes.
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Nakajima et al. (1981) studied this question.
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