PROJECTION OF MICROSTRIP SELECTIVE DEVICES BASED ON IRREGULAR STRUCTURES TO PREVENT INFORMATION LEAKAGE IN HIGH POWER LINES

Abstract

Protection of speech information is an urgent problem of modern society, which is related to the importance of information that functions in commercial and government institutions during confidential negotiations. With the advent of new information transmission technologies, such as fiber optic technologies, new threats to information security appear. Modern fiber-optic communication channels are widely used in various information transmission systems, from main and regional communication lines to local networks, structured cable systems, video transmission in video surveillance systems, cable television systems.

The article deals with the problem of protecting information of optical fiber communication systems from unauthorized access. It is shown that the presence of a photoreceiver near an optical fiber significantly affects the processes in the waveguide and the surrounding space between the fiber and the aperture of the receiver. The article proposes an approach to creating circular models of planar optical waveguides, in which the optical waveguide is presented in the form of a segment of an irregular transmission line in the transverse direction for TE and TM modes. The obtained equivalent circuits allow the analysis of planar optical waveguides by the methods of the theory of electric circuits, which greatly simplifies the process of developing integrated optics devices. On the basis of Maxwell's equations, a circular planar optical fiber replacement scheme was obtained, taking into account the response of the photoreceiver. It is shown that the presence of a photodetector affects both the distribution of the source functions and the nature of the dispersion dependence of the optical fiber. Calculated ratios for determining the field near the receiver aperture with arbitrary distribution of the field in the core of the optical waveguide are presented. With the help of the obtained results, it is possible to determine the signal detection zones of main optical communication lines.