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We experimentally demonstrated 400-Gb/s transmission over 10-km standard single-mode using discrete multi-tone (DMT) and four 1.3-\(\mu \) m local-area-network wavelength-division-multiplexed externally modulated lasers. A reasonably good system margin has been obtained. We have also investigated the fundamental limitations of using semiconductor optical amplifiers for DMT-based systems.
We demonstrate closed-loop control of a MEMS phased array using an optical interferometer designed for in-situ phase-measurement. Phase resolution is comparable with commercial interferometers and we achieve beamsteering without calibration.
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