High-speed single-photon detector based on simple lc filter

  A simple LC low pass filter (LPF) circuit and InGaAs/InP avalanche photodiodes (APD) are used to fabricate 200 MHz high speed single-photon-avalanche-detector (SPAD), working in the near infrared ray (NIR) band. The SPAD is driven by pulse gate signals, and the group of 880 MHz and 175 MHz LPFs based on 7th order elliptic filter are used to suppress the capacitive response of the avalanche diode. At the work condition of -40℃, the SPAD detection efficiency, dark count probability and after-pulse probability are 11.8%, 2.22×10-6/gate and 1.89%, respectively. Under the condition of detection efficiency of 10%, the dark count probability increases as the working temperature increases, while the after-pulse probability decreases. When the reverse direct current bias increases, under the condition of the temperature and gate amplitude unchanged, the detection efficiency can increase and reach a stable value, while the dark count probability and after-pulse probability increase persistently. Moreover, a 1 GHz sine gating SPAD achieves high performance using the same group of LPFs. At the work condition of -40℃, the 1 GHz SPAD detection efficiency, dark count probability and after-pulse probability are 11%, 1.9×10-6/gate and 1.48%, respectively.


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本文作者2018-09-22 08:11
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