Method for detecting gigahertz single photon with low time jitter and low noise

A single-photon detection and time jitter technology, applied in instruments and other directions, can solve the problems of large time jitter, difficult to meet the requirements of ranging, and reduce the amplitude of the avalanche signal, so as to maintain the amplitude and integrity, reduce the time jitter, and maintain the avalanche signal. Amplitude effect

Active Publication Date: 2011-11-02
EAST CHINA NORMAL UNIVERSITY
View PDF5 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while filtering the noise, the corresponding spectral components of the avalanche signal are also filtered out, which destroys the integrity of the avalanche signal. Multiple filtering will not only reduce the amplitude of the avalanche signal, but also increase the t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for detecting gigahertz single photon with low time jitter and low noise
  • Method for detecting gigahertz single photon with low time jitter and low noise
  • Method for detecting gigahertz single photon with low time jitter and low noise

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example: such as Figure 1-2 As shown, the numbers 1-13 respectively indicate: detection circuit 1, noise suppression circuit 2, signal processing circuit 3, phase shifter 4, radio frequency amplifier 5, low pass filter 6, radio frequency amplifier 7, comparator 8, adjustable attenuation Detector 9, power splitter 10, sinusoidal signal generator 11, high power amplifier 12, band pass filter 13.

[0018] Such as figure 1 As shown, the detection circuit converts the single-photon signal into an electrical signal through the APD. In the converted electrical signal, the avalanche signal is annihilated in the spike noise caused by the capacitive effect of the APD, and the avalanche signal is extracted by the noise suppression circuit. The noise suppression circuit is composed of a low-pass filter and a balance circuit. The signal is first passed through the low-pass filter and then balanced with the attenuated sinusoidal signal to remove noise and extract the avalanche si...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to the field of quantum secret communication and weak infrared light detection in the technical field of optical fiber communication, in particular to a method for detecting a gigahertz high-speed near infrared single photon with low time jitter and low noise. A control circuit related to the method consists of a signal detection circuit, a noise suppressing circuit and a signal processing circuit, wherein the noise suppressing circuit is used for extracting an avalanche electric signal by the following steps of: dividing a sine signal of gigahertz into two paths; loading one path serving as a gate signal on an avalanche photoelectric diode; transmitting a response output signal of the avalanche photoelectric diode to a low-pass filter; attenuating the other path of sine signal to an amplitude which is same as that of the response signal of the avalanche photoelectric diode passing through the low-pass filter; and transmitting the other path of sine signal to a balance circuit for balancing with the response signal of the avalanche photoelectric diode passing through the low-pass filter to remove spike noise and extract the avalanche electric signal. In the method, the spike noise is removed in a way of combining low-pass filtering with the balance circuit, so that the avalanche signal is extracted, higher detection efficiency is achieved, and the time jitter is controlled within dozens of picoseconds.

Description

technical field [0001] The invention relates to the field of quantum secure communication and weak infrared light detection in the field of optical fiber communication technology, and in particular to a gigahertz high-speed near-infrared single-photon detection method with low time jitter and low noise. Background technique [0002] Single-photon detection technology is one of many technologies for ultra-sensitive optical signal detection, and it has a very wide range of applications in physics, chemistry, biology and other disciplines as well as engineering applications. In recent years, with the rise of quantum information science and the development of ultrasensitive spectroscopy, single photon detector technology has played an increasingly important role in it. [0003] Among the single-photon detection technologies in many bands, the near-infrared single-photon detection technology has attracted more attention due to its wide application and importance, especially in t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01J11/00
Inventor 梁焰简轶任旻吴光陈修亮武愕潘海峰曾和平
Owner EAST CHINA NORMAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap