METHOD FOR RECEIVING OPTICAL SIGNALS Russian patent published in 2022 - IPC G01R19/175 H01L31/107 

FIELD: optical technology.

SUBSTANCE: invention relates to the reception of optical signals, in particular, to the technique of receiving signals using avalanche photodiodes. The method for receiving optical signals using an avalanche photodiode includes threshold signal processing and the formation of output pulses using a threshold device when the signal from the output of the photodiode exceeds the specified threshold of operation, while the offset voltage of the photodiode is increased from the initial level of U_offs1 to the operating level of U_offsM at a speed of where ΔU_sm is the stage of regulation of the offset voltage in one control cycle; ΔT=KΔt the duration of the microplasma monitoring cycle; is the number of control cycles in one cycle; p_p the confidence limit for estimating the probability of microplasma generation; t the reliability of determining p_p; Δt the duration of the microplasma check cycle; at the same time, in the process of regulation, the trigger threshold is continuously adjusted in the mode of noise automatic threshold adjustment, maintaining a preset threshold/noise ratio, and the presence of pulses exceeding the level corresponding to the amplitude of microplasmas is checked, when registering the first such pulse at the moment t_M, the avalanche multiplication coefficient M reached by this moment is set by fixing the offset voltage of the photodiode U_offsM(t_M), the threshold level is simultaneously fixed, after which receiving optical signals starts.

EFFECT: achieving the maximum sensitivity in all operating conditions, taking into account microplasma breakdowns and normal noise with a minimum time to reach the optimal avalanche mode.

1 cl, 3 dwg