Bipolar bias avalanche photo diode (APD) single photon detection system

Abstract

The invention discloses a bipolar bias APD single photon detection system. The system comprises an APD circuit, a positive and negative bipolar bias generation circuit, a bipolar gate pulse generation circuit, a first transmission line transformer circuit, a second transmission line transformer circuit, a high-speed comparator circuit used for identifying avalanches. The system aims to use the bipolar gate pulses to be matched with bipolar direct current bias to excite an APD and detect positive and negative avalanche signals, positive and negative gate pulses are equivalent to unipolar bias of absolute amplitude sum of two gate pulses added on the APD, excitation of single photon avalanches of the APD under low direct current bias voltage and high gate pulse amplitude is facilitated, and accordingly, effects of dark counting and after pulses are reduced and the detection efficiency and the work efficiency of a single photon detector are improved .

Description

[technical field] [0001] The invention relates to single-photon sensitive detection technology, in particular to a system for realizing high-speed single-photon detection by using positive and negative bipolar gate pulses combined with positive and negative bipolar bias voltages. [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 the quantum security com...

AI Technical Summary

Problems solved by technology

Due to the rapid shutdown method, the active suppression circuit overcomes the shortcoming of the long recovery time of the passive suppression circuit, and the avalanche time is short, and the after-pulse probability is low

However, since there are no photons, the APD is still in the Geiger mode, so that the dark count under the active suppression circuit is higher than that of the gate pulse mode described later.

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