METHOD FOR RECEIVING PULSED OPTICAL SIGNALS Russian patent published in 2021 - IPC G01S17/02 H04B10/60 

FIELD: signal reception.

SUBSTANCE: invention relates to the field of signal reception and relates to a method for receiving pulsed optical signals using an avalanche photodiode. The method includes receiving, amplifying and generating standard pulses when the amplified signal exceeds a predetermined response threshold. In this case, a test optical signal is preliminarily fed to the photodiode, its value after amplification is determined, the rms value of the noise is determined, the bias voltage of the photodiode is changed, thereby adjusting the avalanche multiplication factor M, and the ratio η of the amplitude of the output signal S to the rms value of the noise σ is determined. The avalanche multiplication factor is set such that the ratio η(Μ_opt)=S/σ is maximum, and the probe signal is turned off. The magnitude of the response threshold is set so that the frequency f of exceeding the threshold by noise emissions is within the range F_min<f<F_max, where F_min and F_max are the lower and upper tolerance limits for the frequency f, and the value f=Ν/T is determined by counting the number N of standard output signals for the duration T of the σ measurement period. After that, they start receiving signals.

EFFECT: invention ensures high threshold sensitivity in all operating conditions.

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