Substantiation of methods for improvement of high­speed atmospheric digital fiber­optical transmission systems by extending the signal parameter «Base»

DOI: 10.31673/2412-9070.2019.054043

Abstract

An analysis of the use of fiber optic transmission systems in local access networks has shown that in some cases they are poorly operational in terms of laying transmission lines and not always better, and can lead to significant financial costs, especially when laying down time lines. One of the ways to ensure the mobility of long-distance information transmission and in areas where it is difficult to lay fiber optics as an alternative is to use atmospheric optical communication systems. The disadvantage of this system is its dependence on the state of the atmosphere, namely the presence of various precipitation, especially fog. To eliminate this deficiency, AOLZs are being designed and deployed at the present stage, which is a combination of atmospheric communication with radio relay communication system. In addition to high availability, this combination allows you to build a system with duplicate channels. In turn, the radio relay channel in the conditions of high saturation of the space of the signal through different electromagnetic radiation is subject to various interferences and interferences. Generally, the most important characteristic of communication security against powerful natural and artificial radio interference at the signal level is noise immunity: the ability of the communication system to function, control under the influence of noise and interference of artificial and natural origin. However, the well-known sources of noise immunity and «signal base» do not fully take into account the specifics of communication systems using broadband signals and antenna systems with narrow directional patterns, in particular those that can be used in combined AOLS and in perspective optical laser systems with air-space communication channels. The article analyzes the interrelation of the noise immunity characteristics of special radio channels of information transmission with the parameter of the signal «base». The expediency of bringing this parameter to the case of atmospheric optical lines for radio duplication is shown to be more general by introducing a «field» component. It is proposed to use a transmitting antenna gain as a component. The specific values of the specified coefficient for the optical link are given.

Keywords: noise immunity; stealth; signal parameter base; atmospheric optical communication line; transmit antenna gain.

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