Single-photon avalanche photodiode calibration system and calibration method
A photodiode and single-photon avalanche technology, applied in the field of quantum communication, can solve the problems of high efficiency and convenience without SPAD tubes, calibration systems and methods, etc., and achieve the effect of easy learning, simple operation, and lower professional level of testers
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Embodiment 1
[0069] Such as figure 1 As shown, a single photon avalanche photodiode calibration system includes: host computer, SPAD calibration system control board, picosecond pulse laser, adjustable optical attenuator, SPAD installation board, and temperature box.
[0070] The SPAD calibration system control board is connected to the picosecond pulse laser through an SMA connection line, and the SPAD calibration system control board generates a light source driving signal and sends it to the picosecond pulse laser.
[0071] The picosecond pulse laser as a calibration light source is connected to the adjustable optical attenuator through an optical fiber, and the picosecond pulse laser outputs light pulses to the adjustable optical attenuator.
[0072] The adjustable optical attenuator is connected to the SPAD to be tested through an optical fiber, and the adjustable optical attenuator attenuates the received optical pulse, and outputs a single-photon level pulsed optical signal to the S...
Embodiment 2
[0088] Such as image 3 As shown, the present invention discloses a single photon avalanche photodiode calibration method based on the calibration system described in Embodiment 1, comprising the following steps:
[0089] Step 1: Connect test equipment;
[0090] Step 2: Refrigeration, power on, and preheating;
[0091] Step 3: output light pulse;
[0092] Step 4: Output light intensity adjustment;
[0093] Step 5: Carry out gated differential signal scanning;
[0094] Step 6: The SPAD to be tested generates an avalanche signal;
[0095] Step 7: Perform delayed scanning;
[0096] Step 8: Adjust the bias voltage configuration value and perform a one-key test.
[0097] Described step one is specifically:
[0098] (1) Establish the data connection between the host computer and the SPAD calibration system control board;
[0099] (2) Establish the hardware connection between the control board of the SPAD calibration system, the picosecond pulse laser, the adjustable optical ...
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