Free-running single-photon detection system for high-speed quenching and recovery

A single-photon detection, high-speed technology, applied in the field of single-photon detection and quantum communication, can solve the problems of long dead time, the potential of detector detection efficiency and count rate cannot be fully realized, and high detection efficiency cannot be satisfied, and achieve suppression. After-pulse probability, the effect of improving detection efficiency and counting rate

CN107271036BActive Publication Date: 2019-01-04UNIV OF SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-01-04

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Abstract

The invention discloses a free-running single-photon detection system for high-speed quenching and recovery, which is characterized in that it includes: a SPAD and its peripheral circuit module 1, a discrimination and shaping module 2, a delay and amplification module 3, and an active quenching and Recovery module 4; wherein: SPAD and its peripheral circuit module 1 extract the avalanche signal and input it to the screening and shaping module 2, and the screening and shaping module 2 obtains the counting signal after screening and shaping; the counting signal is input to the delay and amplification module 3, and then It is divided into two paths, one path is passed through the operational amplifier to obtain the active quenching signal, and the other path is delayed to set the dead time and shaped to obtain the active recovery signal; the active quenching signal and the active recovery signal are respectively input to the active quenching and recovery module 4. The level signal output by the active quenching and recovery module 4 is connected to the anode of the SPAD to realize high-speed quenching and recovery of the SPAD. The system can simultaneously improve the detection efficiency and count rate of the single photon detector.
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Description

technical field

[0001] The invention relates to the technical fields of single-photon detection and quantum communication, in particular to a free-running single-photon detection system with high-speed quenching and recovery. Background technique

[0002] Semiconductor single-photon detectors are essential tools for ultra-weak light detection, and have a wide range of application requirements in many fields. The basic working principle of the semiconductor single photon detector is that the single photon avalanche photodiode (SPAD) works in the Geiger mode, that is, the reverse bias voltage of the SPAD exceeds its avalanche breakdown voltage. When the incident single photon is absorbed, a pair of carriers will be generated. Due to the impact ionization effect, the carriers form an avalanche effect and finally output a macroscopic current. After detecting the avalanche signal, the back-end quenching circuit will output a detection signal, and at the same time reset the circu...

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] figure 1 A schematic structural diagram of a high-speed quenching and recovery free-running single-photon detection system provided by an embodiment of the present invention. Such as figure 1 As shown, it mainly includes: SPAD and its peripheral circuit module 1, screening and shaping module 2, delay and amplification module 3, and active quenching and recovery module 4; where:

[0027] SPAD and its peripheral circuit module 1 extract the ...