In this paper, the statistical characteristics of output signals in optoelectronic systems with a limited dynamic range are considered. The experimental results concerning noises probability densities are adduced. It has been shown that the law of output signal distribution depends on attenuation factor of neutral filter used for matching the dynamic range. The output signal distribution law is well approximated by the steady distributions with characterization index <$E0~<<~alpha~<<~2>. Using the stable law as a limiting one allows to avoid the contradiction between experimental data and common mathematical models of signals based on the Poisson and Gaussian statistics and to reduce weak signals detection errors in optoelectronic systems with implementation of neutral filters for matching the dynamic range.

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