Self-cancellation single photon detection system

Abstract

The invention belongs to the technical field of communication, and discloses a self-cancellation single photon detection system. The system comprises a mixer, an avalanche photodiode APD, a trans-impedance amplifier TIA, a sample resistor R and a comparator. A negative electrode of the avalanche photodiode APD is connected with a direct-current bias VD, and a positive electrode is grounded through the sample resistor; a positive electrode of the avalanche photodiode APD is connected with an input end of the trans-impedance amplifier TIA; an output end of the trans-impedance amplifier TIA is connected with a negative electrode of the avalanche photodiode APD and the comparator respectively; a single photon signal to be tested and a local oscillator light signal are mixed by the mixer, then an optical signal is output, and the optical signal is sent to a light input end of the avalanche photodiode APD; an output signal of the trans-impedance amplifier TIA feeds back and adjusts the voltage across two ends of the avalanche photodiode APD; and the comparator counts the pulse of the single photon. The self-cancellation single photon detection system provided by the invention is high efficiency, convenient and reliable.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a self-quenching single-photon detection system. 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 and engineering applications. In recent years, with the rise of quantum science and the development of ultrasensitive spectroscopy, single photon detector technology has played an increasingly important role in it. [0003] At present, there are two main methods for single photon detection system: sinusoidal gated low-pass filtering method and differential method. The sinusoidal gating low-pass filtering method utilizes the single-frequency characteristics of the sinusoidal gating signal and is easy to filter, and uses a multi-stage RC filtering method to filter out the gating signal and obt...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a self-quenching single-photon detection system, which solves the technical problems in the prior art that the integrity of the avalanche signal is damaged, additional circuit noise is added, and the avalanche amplitude is reduced, resulting in low signal-to-noise ratio, insufficient gain, and complicated circuits.

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