METHOD FOR RECEIVING OPTICAL SIGNALS Russian patent published in 2021 - IPC G01S17/48 G01S7/486 

FIELD: radio engineering.

SUBSTANCE: invention relates to a technique for separating signals from noise using avalanche photodiodes and can be used in areas where maximum signal-to-noise ratio is required. The method for receiving optical signals using an avalanche photodiode includes threshold processing of signals and the formation of output pulses when the signal from the output of the photodiode exceeds the specified response threshold. The values of the multiplied and non-multiplied noise currents of the photodiode and the noise factor of the avalanche multiplication are preliminarily determined, after which the avalanche multiplication factor Μ of the photodiode is set so that its value, taking into account the adjustment tolerance, is close to the optimal value where Ι₀² and J_m² are, respectively, the squares of the components of the non-multiplied and multiplied noise currents of the photodiode in the avalanche-free mode, reduced to its output; α is the noise factor determined by the structure of the photodiode. The threshold of the threshold device is adjusted so that the frequency f of exceeding the threshold level by emissions of the noise process is within f₁<f<f₂, where f₁ and f₂ are the lower and upper tolerance limits for the frequency f, and the f=Ν/Τ value is determined by counting the number N output pulses in a predetermined time T.

EFFECT: invention ensures maximum signal-to-noise ratios in all operating conditions.

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