APD single photon detector circuit and avalanche signal discrimination method

Abstract

The invention discloses an APD single photon detector circuit and an avalanche signal discrimination method. The APD single photon detector circuit comprises a DC bias voltage unit, a gated pulse generator and an avalanche photon diode (APD), wherein the DC bias voltage unit is connected with a cathode of the APD through a first resistor R1; the gated pulse generator is connected with the cathode of the APD through a first capacitor C; an anode of the APD is grounded through a second resistor R2; and the anode of the APD is further sequentially connected with a high-speed zero-crossing comparator and a level measurement and comparison circuit, and the level measurement and comparison circuit comprises a detection module, a judgment module and a signal generation module. The APD single photon detector circuit is simple in circuit structure, does not need to perform separation on pulses, facilitates to reduce the implementation cost and improves the detection speed and efficiency. The avalanche signal discrimination method has the advantages of high avalanche signal discrimination ability, high accuracy and the like.

Description

technical field [0001] The invention relates to the technical field of single photon detection, in particular to an APD single photon detector circuit and an avalanche signal discrimination method. Background technique [0002] Single-photon-level optical signal detection belongs to the field of weak light detection, and has important applications in many fields such as quantum communication, laser ranging, biomedicine, and spectral detection. At present, the devices that can detect single photon signals mainly include photomultiplier tube (PMT) and APP. PMT has the disadvantages of large size, high driving voltage, low gain, and difficulty in integration, while APD has the opposite characteristics. Therefore, the core device of single photon detection device mainly adopts APD. When detecting signals, the APD works in Geiger mode, and its internal depletion layer generates a very strong electric field. When photons enter the electric field, electron-hole pairs will be gene...

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Problems solved by technology

These methods have certain disadvantages: it is very inconvenient to adjust the repetition frequency from the differential circuit; the high-speed sine wave circuit is complex, requiring additional microwave devices and high-frequency signal generators; the dual APD balance method requires that the properties of the two APDs must be highly similar. And APD is expensive, so this solution is less cost-effective

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