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We have proposed and developed array-antenna-electrode electro-optic modulators for next-generation millimeter-wave wireless links. In this paper, newly fabricated modulators with a long array of 16 elements and low-optical loss are reported. The wireless-optical signal conversion was successfully demonstrated at 59 GHz with a modulation index of 20 mrad by 20 mW irradiation.
Electro-optic wireless millimeter-wave-lightwave signal converters using planar Yagi-Uda array antennas coupled to resonant electrodes were proposed. High conversion efficiency is obtainable due to high gain in Yagi-Uda antennas. The designed device at 38GHz is reported.
A new electro-optic duo-binary modulator is proposed. Utilizing non-periodic polarization reversal structures, a pair of Gaussian-like modulation frequency responses with an opposite sign is obtainable. It operates with a single duo-binary signal without electrical/optical filters.
The polarization reversal technology of ferroelectric optical crystals enables us to construct new high-speed electro-optic modulators with advanced functions; quasi-velocity-matched phase/intensity modulators, single-side band (SSB) /frequency-shift-keying (FSK) modulators operated with a single microwave signal, and duo-binary modulators. These devices are attractive for applications in many microwave...
Optical pulse generation by the electrooptic modulation method was demonstrated using a polarization-reversed electrooptic modulator with resonant electrodes. 25 ps pulse trains with ~15 GHz repetition frequency and negligible timing jitter were observed with a streak camera.
Millimeter-wave optical single-sideband modulation by using guided-wave electrooptic modulators with periodic polarization-reversal was experimentally demonstrated. A sideband suppression ratio over 27 dB was obtained at 38 GHz modulation. It leads to the applications to the radio-on-fiber systems.
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