Abstract

The performance of light intensity modulation using guided-to-radiation mode coupling through the electrooptic effect is investigated theoretically and experimentally. We show that high modulation efficiency is obtainable if a heterostructure waveguide is employed that has appropriate refractive indices to bring forth large field overlap of the two coupled modes. Waveguides of Nb2O5 or Li(Nb0.1Ta0.9)O3 film on a structure could have modulation efficiency of more than 100 dB/cm. The experiment was LiTaO3 substrate carried out in a Nb2O5–LiTaO3 structure fabricated by rf reactive sputtering, and we obtained the measured modulation depth as high as 45 dB/cm at an applied voltage of 400 V across 55-μm gap electrodes.

© 1984 Optical Society of America

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