Single-photon detector circuit and detection method thereof

A single-photon detector and circuit technology, applied in the field of single-photon detection, to achieve the effect of improving detection efficiency and improving detection efficiency

Inactive Publication Date: 2012-10-17
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

These methods all perform some processing on the electrical spike and avalanche signal to achieve the effect of weakening or eliminating the electrical spike, and these methods may introduce new noise and cause distortion of the avalanche signal

Method used

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  • Single-photon detector circuit and detection method thereof
  • Single-photon detector circuit and detection method thereof
  • Single-photon detector circuit and detection method thereof

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Embodiment

[0031] like Figure 4As shown, a pulse-splitting single-photon detector includes the first resistor R1~the tenth resistor R10, the first capacitor C1~the fourth capacitor C4, the inductor L1, the avalanche photodiode APD, the high-speed amplifier ADL5541 of ADI Company, and the high-speed amplifier of ADI Company High-speed comparator ADCMP553 and high-speed counter MC100EP016 of ONSEMI Company.

[0032] The APD is biased below the avalanche voltage through the DC bias unit VDC, the gate voltage is synchronized with the input light pulse, and is coupled to the cathode of the APD through the first capacitor C1, so that when the light signal arrives, the bias voltage reaches above the avalanche voltage. The electrical peak and avalanche signal generated by the gating pulse are amplified by the high-speed amplifier ADL5541, and then the amplitude is identified by the high-speed comparator ADCMP553 to generate one or two pulse outputs; the identification result is counted by the ...

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Abstract

The invention discloses a single-photon detector circuit and a detection method thereof. The detection method comprises the following steps of: separating an electric peak and an avalanche signal which are generated by a gate control pulse on time domain by using a high-speed amplifier of which the speed is higher than that of the conventional gate control single-photon detector in the single-photon detector circuit; responding the electric peak and the avalanche signal respectively within a time interval of subnanosecond by a high-speed comparator to generate pulse output; and judging whether the avalanche signal is generated or not by a high-speed counter according to the number of pulses so as to screen a single-photon signal. The single-photon detector circuit and the detection method have the advantages that a structure is simple, the original avalanche signal can be separated out, the avalanche signal is utilized fully, and the single-photon detection efficiency is high.

Description

technical field [0001] The invention relates to the technical field of single photon detection, in particular to a single photon detector circuit and a detection method thereof. Background technique [0002] Single-photon detection technology is widely used in quantum key distribution system, high-resolution spectral measurement, non-destructive material analysis, high-speed phenomenon detection, precision analysis, atmospheric pollution measurement, bioluminescence, radiation detection, high-energy physics, astrophotometry, phototimer Domain reflection and other fields have a wide range of applications. Due to its important position in the high-tech field, the single photon detector has become one of the key research topics in the optoelectronics circles of various developed countries. [0003] Among the implementation schemes of single photon detection, the most commonly used one is the scheme using avalanche photodiode (APD) as the detection device. When the operating v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 魏正军王金东张智明郭健平
Owner SOUTH CHINA NORMAL UNIVERSITY
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