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High-speed, low-noise resonant-cavity avalanche photodiodes

In this paper we describe a separate absorption and multiplication (SAM) avalanche photodiode (APD) in a resonant-cavity configuration. This APD has achieved low noise and record bandwidths. In the low-gain regime, bandwidths >20 GHz were observed. The gain-bandwidth product was 130 GHz, which is the highest reported for a bulk multiplication region and comparable to the best multiple-quantum-well APDs.