This work presents results of researhes of fabricated pilot sample of chiral few-mode optical fiber (FMF) with induced twisting of 10 and 66 revolutions per meter, core diameter 11 µm (that almost corresponds to standard singlemode optical fibers), typical “telecommuniction” cladding diameter 125 µm and improved height of step refractive index profile. Proposed few-mode optical fiber supports 4 guided modes over “C”-band. We considered design and selection of desired technological parameters, based on results of computations, performed by both rigorous and approximation methods. Spectral curves of dispersion parameters are reprented as well as results of experimental measurements near-field laser beam profile and spectral and pulse responces of laser-excited optical signals. 

The article discusses the theory of quantum image processing and quantum image manipulation (fast geometric transformations, including the flip, orthogonal rotations and limited geometric transformations). In this work we have investigated the area of quantum image processing and have tested the FPQI model. Models (developed in the work and others) were investigated by explicitly modeling quantum behavior on a large quantum system. A basic scheme for encoding 2×2 image has been created to gain a clearer understanding of the mechanics of quantum image models. 

 The article presents the development prospects of planar optical waveguides for high-speed data transmission systems optoelectronic buses by polymer materials. The advantages and disadvantages of using nonspecialized polymeric materials for general use are revealed. The polymer planar optical waveguides fabrication technologies are proposed. The main losses types in planar optical waveguides, the reasons for their occurrence, as well as approaches to their reduction are determined. Using the example of PDMS polymer and soft lithography technology, the technological process critical stages of polymer planar optical waveguides production are noted, which contribute to an scattering losses increase. For each stage, algorithms are proposed to prevent an scattering losses increase. These algorithms were implemented in practice in the manufacture of layouts of polymer planar optical waveguides of the optical-electronic data transmission bus. 

Solving tasks of creation, correction and parametric control of signals excitation hydroacoustic phased antenna grids is actual problem of creating multichannel generated devices, based on switch-mode amplifiers with pulse-width modulation. In this article were reviewed correction methods output signals of hydroacoustic transmission paths, periodic pulse sequence creation and parametric voltage level control of excitation channels of phased antenna grid with abrupt decrease impedance of hydroacoustic converters. Was shown the perspective implementation digital technologies for improvement parameters modes of hydrolocation with deterministic library of signals. Presented digital control methods of output signals in hydroacoustic transmission paths are characterized by scientific novelty and originality of the proposed technical decisions. 

Active metamaterials usage is one of the most promising ways to control the characteristics of antennas, waveguides, and other microwave devices. This article proposes the controlled metamaterial design in the form of an electromagnetic crystal with switches located at the nodes of the crystal lattice. This metamaterial application for changing the fundamental mode phase of the WR-137 waveguide is investigated. Controlling the characteristics of the metamaterial is performed by switching pin diodes at the nodes of the lattice, so this control method allows you to achieve a high speed system, as well as to switch only certain pin diodes. Electrodynamic modeling was carried out, on the basis of which the characteristics of the waveguide were obtained for different metamaterial closed nodes combination, which changes the the electromagnetic wave phase. 
 

 The article discusses the implementation of directional couplers in a microstrip line, designed for communication lines in the frequency range of 2‒3 GHz, on a substrate made of a widely used and generally available material RO4350, with a coupling factor of 3‒7 dB. These directional couplers have been designed with additional boundary conditions to reduce the size of the device. In the course of numerical modeling, the correction factors used for preliminary analytical calculations were refined. The data of the numerical experiment were verified using the measurements prototype model.

The article investigates the switching processes in class D modulators for optimal control of active devices (transistors, triodes, tetrodes, etc.) in real conditions, to reduce power losses in them and non-linear distortions of the modulator output voltage, as well as more accurate determination of the devices efficiency. The presented mathematical model takes into account the inertia of the switching processes, the duration of the rise and fall fronts of voltage and current pulses, as well as losses in switching elements. 
 

When designing the antenna field of a stationary HF transmitting radiocenter, it is necessary to provide for reserving ground-based symmetrical antennas operating on round-the-clock radio directions with backup, fastdeployable antenna systems. As such antennas, it is proposed to use asymmetric vertical dipoles, active phased antenna arrays (APAA) based on them with a controlled directional pattern. This article considers methods for calculating such systems, a method is developed for determining the phase relationships of currents at the inputs of APAR elements, taking into account its placement and functioning on a real object. The results of route tests of single antennas and APAA on a radio link with a length of 650 km are presented. 

 The article presents a model for auditing the security of a critical information infrastructure object by test information and technical influences. This model formalizes an object in the form audit process of a multilevel topological model, the individual levels of which correspond to: resource costs for impacts, test information and technical impacts, vulnerabilities, object elements and damage levels. The use of this model in audit practice will make it possible to substantiate the most effective impacts on the basis of the “efficiency / cost” criterion, as well as form test suites that will ensure the rational completeness of the audit of a critical infrastructure facility. 

The article analyzes the types of remote sensing data and methods of their processing, which is implemented in order to identify negative natural phenomena and man-made impacts on the environment on the earth’s surface, their characteristics and distribution conditions. The substantiation of the pipelining remote sensing data processing necessity in Web-oriented services environmental monitoring services is carried out. The article substantiates the architectural organization of Web-oriented services for environmental monitoring services and the functional scheme of the data acquisition and processing system. Based on the analysis of the thematic and POSTthematic data processing methods, the organization of a multistage (pipeline) system for the implementing actions with them that provide versatile environmental monitoring is justified. 

 Over the past decade, in addition to multiservice networks, blockchain technology has undergone significant development due to the possibility of organizing a safe, integral, reliable exchange and storage of information. Due to the great demand for the technology, there is a problem of data transmission to the operators' networks. At the same time, a key task appears to consider the effect of this technology on network characteristics to predict traffic behavior on the network and ensure the required service quality indicators, as well as the stability of the state of the public communication network elements when the distributed ledger technology is operating. However, to consider and analyze the influence of technology in a full-scale experiment is a labor-intensive task that cannot always be performed, therefore, in this article, the authors propose to consider approaches to structuralparametric modeling of these systems. 
 

 Deep packet inspection systems on communication networks are used to identify the application generating a specific traffic flow. The issues related to modeling and design of deep packet inspection systems remain poorly understood. In this paper, a software technique for evaluating the effectiveness of the hardware composition of the servers of the deep packet inspection system is presented, using a mathematical model of such a system and software search methods. The description of the program search by the maximum element method and the Hook-Jeeves method is given. A modernization of the Hook-Jeeves method for a monotonically decreasing function is proposed. Comparison of the methods by the number of search steps is performed.