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Low-time jitter type single photon detector

A single photon detector and time jitter technology, applied in the direction of instruments, etc., can solve the problems of difficult to meet the requirements of distance measurement, large time jitter, etc., and achieve the effect of reducing time jitter, reducing time jitter, and good versatility

Pending Publication Date: 2017-08-08
HUAZHONG NORMAL UNIV
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Problems solved by technology

[0005] In laser ranging, the time jitter of the single photon detector directly determines the measurement accuracy of the whole device. The time jitter of the existing single photon detector is generally relatively large, which is difficult to meet the distance measurement requirements.

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  • Low-time jitter type single photon detector

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] figure 1 The shown low time jitter single photon detector includes a single photon signal detection module 1 , an avalanche signal extraction module 2 and an avalanche signal processing module 3 . The single-photon signal detection module 1 is used to convert the single-photon signal into an avalanche electrical signal. The single-photon signal detection module 1 includes an avalanche photodiode APD, which converts a DC voltage V A Reversely loaded across the avalanche photodiode, the DC voltage V A less than the avalanche voltage of the avalanche photodiode V B ;amplitude is V g The gating signal is input to the cathode of the avalanche photodiode from the gating signal input terminal 1.2 through the DC blocking capacitor C, and the gating signal has a frequency of f g sinusoidal signal, the V g , V A and V B Satisfy ...

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Abstract

The present invention discloses a low-time jitter type single photon detector, which comprises a single photon signal detection module (1), an avalanche signal extraction module (3) and an avalanche signal processing module (3). The single photon signal detection module (1) comprises an avalanche photoelectric diode APD working in the gated mode. The avalanche signal processing module (3) comprises a limiting amplifier (8). The input terminal of the limiting amplifier is connected with the output terminal of an avalanche signal extraction module (2). The working bandwidth of the limiting amplifier (8) is larger than the bandwidth of an avalanche electric signal. The input signal threshold value of the limiting amplifier (8) is greater than the amplitude of the background noise of the output signal of the avalanche signal extraction module (2). The limiting amplifier (8) converts the avalanche electric signal into a digital signal and outputs the digital signal. The low-time jitter type single photon detector is simple and reliable, and the time jitter of the detection system is greatly reduced. Meanwhile, the detection efficiency, the dark count rate and other performances of the system are not influenced at all.

Description

technical field [0001] The invention relates to the fields of weak near-infrared light detection and quantum secret communication technology in the field of optical fiber communication, and specifically refers to a single photon detector with low time jitter. Background technique [0002] Single photon detection has a wide range of applications in spectral analysis, bioluminescence, precision measurement, quantum information and other fields. Among the current single-photon detection schemes, the avalanche photodiode (APD) has become the most practical single-photon detection device because of its high detection efficiency, fast response speed, small size, and low cost. [0003] When the APD is used for single photon detection, it must work in the Geiger mode, that is, the reverse bias voltage of the APD is greater than its avalanche voltage. In the Geiger mode, the carriers generated after the APD absorbs a single photon will trigger the so-called "self-sustained avalanche...

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Application Information

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IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 吴青林姜倩文林楚明方森智
Owner HUAZHONG NORMAL UNIV
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