A high dynamic range photon counting weak light signal measuring device and method

Abstract

The invention discloses a large-dynamic-range photon counting weak light signal measuring device. The large-dynamic-range photon counting weak light signal measuring device comprises an optical time domain reflection sensing system, a waveform generator, a gating signal generation module, a detector driving module, a signal processing module, a time signal analysis module and a processor. The processor obtains the rate of photon counting of different time points finally. The gating signal generation module comprises a sinusoidal signal generation module, a range modulator, a band-pass filter and a range amplification module, wherein the sinusoidal signal generation module, the range modulator, the band-pass filter and the range amplification module are sequentially connected. The signal processing module comprises a band-elimination filter, a signal amplification module and a judgment device. The invention further discloses a large-dynamic-range photon counting weak light signal measuring method. According to the large-dynamic-range photon counting weak light signal measuring device and method, large-dynamic-range measurement of weak light signals can be achieved within a single measurement period, the measurement efficiency is high, and the measurement time can be obviously shortened.

Description

Technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a high dynamic range photon counting type weak light signal measuring device and method. Background technique [0002] Single Photon Avalanche Diode (SPAD) can detect a single photon, and has important theoretical research value and application value in the fields of quantum communication and optical fiber sensing. When the single-photon avalanche detector (SPAD) works in Geiger mode, the working voltage at both ends is higher than its avalanche breakdown voltage, so that when the detector absorbs a single photon, it will generate an avalanche signal, which can be used for single-photon detection. In Geiger mode, the difference between the operating voltage and the avalanche breakdown voltage is called the over-bias voltage, and the single-photon detection efficiency increases with the increase in the over-bias voltage. [0003] In Geiger mode, suppression methods are nee...

AI Technical Summary

Problems solved by technology

Both methods divide a test into multiple measurements to increase the dynamic range when measuring weak light signals, but require additional measurements and increase the measurement time

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