Gigahertz impulse gate-control low-pass filtering ultrared single-photon detector

A single-photon detector and low-pass filtering technology, which is applied in the direction of instruments, can solve the problems of difficult extraction of single-photon avalanche signals and difficult effective detection, and achieve good suppression effect, improve detection sensitivity, and reduce post-pulse effects.

Inactive Publication Date: 2010-02-17
ANHUI QASKY QUANTUM SCI & TECH CO LTD
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Problems solved by technology

However, the single photon avalanche signal will be very weak and difficult to detect effectively, but the spike noise generated by the APD junction capacitance has not been significantly reduced, so it becomes more difficult to extract the single photon avalanche signal

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] The basic principle of the present invention is that the spike noise generated by the junction capacitance differential effect of InGaAs / InP APD will cause extremely serious interference to the weak avalanche photoelectric signal, how to effectively suppress the spike noise is the key technology of the GHz single photon detector. For the GHz pulse gating signal, its energy is mainly distributed on the fundamental frequency and its multiplied frequency components. The energy of the peak noise generated by the gating signal passing through the junction capacitance of the InGaAs / InP APD is still mainly distributed on the gating fundamental frequency and multiplied frequency, and the energy on the multiplied frequency component is further increased accordingly. For the GHz gating circuit of an ideal circuit, the energy distribution of its pulse gating interference s...

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Abstract

The invention relates to the fields of quantum secret communication, weak ultrared detection, and the like, and provides an impulse gate-control low-pass filtering ultrared single-photon detector. Theimpulse gate-control low-pass filtering ultrared single-photon detector comprises an impulse gate-control power source, an In-Ga-As-In-P avalanche photodiode circuit, a DC voltage baising circuit, alow-pass filter, a high-speed wideband amplifier, a ultra-high-speed comparator and a counter, wherein gigahertz (GHz) impulse signals output by the impulse gate-control power source are used as gatecontrol signals of the In-Ga-As-In-P avalanche photodiode circuit, and spike noise signals caused by the junction capacitance differential effect of In-Ga-As-In-P avalanche photodiodes by the low-passfilter are used for filtering in a low-pass mode. The gigahertz impulse gate-control low-pass filtering ultrared single-photon detector solves the problem of spike noise interference in the prior art, increases the detection sensitivity of the avalanche signals and can be used for detecting GHz high-speed ultrared photon.

Description

technical field [0001] The invention relates to the fields of quantum security communication and weak infrared light detection, and is an infrared single photon detector. Background technique [0002] Single-photon detection technology has become a popular technology in many fields, such as optical time-domain reflectometry, optical fiber communication, quantum key distribution (QKD), fluorescence and Raman spectroscopy. Traditionally, the photomultiplier tube (PMT) can be applied to single-photon detection, which has low dark count and extremely high time resolution, but its detection efficiency for light with a wavelength exceeding 1 μm is very low (less than 1%), This makes it of little practical value in the field of infrared measurements. Silicon avalanche photodiode (APD for short) can also be used as the core device for single photon detection. It has good performance in the 400nm to 900nm band. The width of the band gap determines that it hardly responds to light w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 赵天鹏刘云何德勇徐军赵义博韩正甫郭光灿
Owner ANHUI QASKY QUANTUM SCI & TECH CO LTD
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