The features of coherent GreenÏs function in a nondispersive medium with spatial-temporal dielectric permittivity Ñuctuations are considered in this paper. General analytical expression for the mean Green Function is obtained at arbitrary covariance function. Numerical simulations were carried out too.

Due to the development of satellite, mobile, cellular, and optical telecommunication systems, a special attention is paid to broad band frequency signals, like signals with wide spectrum, when frequency band of the transmitting signal may be wider than frequency band of the transmitted signal itself. For many telecommunication systems, the ability of transmitting information to several users simultaneously via one and the same channel is very important. A number of methods are applied for this purpose, for instance: the frequency modulation (FM) of the carrier signal (the method of frequency division of transmitting channel), phase modulation (PM) of the carrier signal or pseudo-random modulation (PRM) of the carrier signal. In the conditions of increasing demands on communication systems, the question of creating multi-user systems became very actual. In all cases it is necessary to provide high quality connection on longer distance so that the universal standards should not be violated.

Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Khajishvili M., Gomidze N., Jabnidze I., Makharadze K. and Chikhladze M., "Evalution bandwidth of optical signal via statistical moments of random phase screen", Politeknik Dergisi, 21(1): 123-128, (2018). Politeknik Dergisi, 2018;21(1):123-128 Journal of Polytechnic, 2018;21(1):123-128 ABSTRACTThe majority of the works are dedicated to the specific problem, for instance, scattering from the rough surface although, the general theoretical bases of the statistical and spectral characteristics of the scattered light for the light of non-Gaussian statistics have not been studied so far. The signals with such statistics are produced when the characteristic scales of the refraction factor is in comparison with the size of illuminated region. In the present paper, we discuss the method of signal processing for analyzing first and second order statistical moments of electromagnetic radiation.

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