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A Ge-on-SOI uni-traveling carrier (UTC) photodetector was reported for high-power high-speed applications. The performances, in terms of dark-current, photocurrent responsivity and 3-dB bandwidth, were characterized for analog and coherent communications applications. The responsivity was 0.18 A/W at 1550 nm. The detector with a 40 mu m-diameter demonstrated an optical bandwidth of 2.72 GHz at -5V for 1550nm. The -1dB compression photocurrent at 1 GHz under -7V for 40 mu m-diameter device was about 16.24mA, the RF output power came to be 4.6 dBmw.
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