Abstract

A high-speed optical modulator with cascaded resonant-type electrodes is presented. To reduce the drive power and switch voltage Vπ and to maintain high-modulation efficiencies, resonant reduced-length electrode structures were cascaded and integrated on LiNbO3. Electrical power coupling into the resonators was realized by a single-input source distributed with electrical power dividers and delay lines. As a result, an optical modulator with four resonant-type cascaded electrodes was fabricated and characterized. This device, with a total active-electrode length as short as 3.4 (4 × 0.85) mm, achieved a switch efficiency Vπ • L of 68 V · mm at 25 GHz at 1.55-µm wavelength, resulting in a drive power 8.7 dB less than that required for a traveling wave modulator with the same active length.

© 2006 IEEE

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