METHOD FOR THRESHOLD DETECTION OF OPTICAL SIGNALS Russian patent published in 2021 - IPC G01R19/175 G01J1/04 H01L31/107 

FIELD: optical signal detection.

SUBSTANCE: invention relates to the technique of isolating signals from noise using avalanche photodiodes. A method for threshold detection of optical signals using an avalanche photodiode, including threshold signal processing and the formation of output pulses when the signal from the output of the photodiode exceeds the specified threshold of operation is presented. The frequency f₀ of noise crossing the zero threshold and the frequency f_op of noise triggers in the operating mode is predetermined, the avalanche-free mode of the photodiode offset is turned on, the trigger threshold U is set at a level corresponding to the frequency of noise triggers of the threshold device f<<f₀, the threshold is increased, this threshold is fixed and such an avalanche multiplication coefficient M=M_opt is set, at which the frequency of f_M noise exceeding the threshold U_M becomes equal to the frequency f in the avalanche-free mode M=1 at the threshold U, when the f_M frequency is reached, the achieved avalanche multiplication coefficient M=M_opt is fixed, the threshold is increased to the operating level and optical signals are received.

EFFECT: ensuring the maximum signal-to-noise ratio.

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