Single-photon detector based on an InGaAs avalanche photodiode is one of hot research on the quantum photon, and is
one of the key technologies on quantum communication and quantum image. It is widely used in applications as high
sensitive photon spectrum, high speed optic measurement and so on. A suitable delay and comparator with latch function
circuit are used to prevent positive and negative transient pulses from influencing the detection of true photon induced
avalanches. A dead time modulation feedback control circuit decreases the after-pulse. Especially, ECL difference circuit
is the key of high speed single photon detector. In addition, the detector uses the hot tube fan-cooling method. From the
performance test, the lowest temperature reaches -62°C, the minimum gate pulse width is 2ns (Full-Width-Half-Max,
FWHM) and the dark counter rate is 2.5×10-6 ns-1 with a detection rate of 10MHz when the quantum efficiency is more
than 10%.
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