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Abstract: InGaAs avalanche photodiodes APDs are convenient for single photondetection in the near-infrared NIR including the fibre communication bands1.31-1.55 $\mu$m. However, to suppress afterpulse noise due to trappedavalanche charge, they must be gated with MHz repetition frequencies, therebyseverely limiting the count rate in NIR applications. Here we show gatingfrequencies for InGaAs-APDs well beyond 1 GHz. Using a self-differencingtechnique to sense much weaker avalanches, we reduce drastically afterpulsenoise. At 1.25 GHz, we obtain a detection efficiency of 10.8% with anafterpulse probability of 6.16%. In addition, the detector features low jitter55 ps and a count rate of 100 MHz.



Author: Z. L. Yuan, B. E. Kardynal, A. W. Sharpe, A. J. Shields

Source: https://arxiv.org/







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