The paper proposes a method for generating a given radiation field from the end face of a round open dielectric waveguide. The method is based on solving a system of two Fredholm integral equations of the first kind with respect to the components of electric and magnetic fields tangential to the aperture plane.
At present, fiber-optic communication lines (FOCL) are widely used to transmit information [1]. On their basis, both long (trunk) lines and zonal, metropolitan, intra-object networks are built. Video surveillance, data collection and transmission with high speed require connection to a single (usually fiber-optic) network in a continuous data exchange mode to work in hard industrial production conditions, at oil facilities, to solve the tasks of the "smart city" system, as well as in numerous special applications. However, in many cases it turns out to be either impossible or economically unprofitable to create wired branches to large terminal consumers of information. Therefore, not all objects have the possibility of direct connection to fiber-optic communication lines. The solution to this problem consists in the development and use of methods for interfacing fiber-optic and wireless communication lines using microwave photonics technologies. In particular, it is possible to transfer the spectrum of the information signal to the carrier frequency in the microwave range using optical heterodyning methods. In this way, it is possible to convert modulated optical signals transmitted through optical fiber into modulated radio signals, bypassing the intermediate stages of demodulation and modulation. This leads to a simplification of the communication channel transmitter and a reduction in the distortion of transmitted information related to additional signal conversions.
Currently, the process of introducing photonics into traditional radio frequency systems is in progress. As a result, a new direction has emerged in the field of telecommunications – microwave optoelectronics. Contrasted with standard microwave oscillators, the optoelectronic oscillator (OEO) has a number of advantages. Overcoming the compromise between the frequency tuning band of generation and the level of FM noise is the main one. Another advantage is that the upper limit of the OEO generation frequency is about 110 GHz, which is difficult to realize in the case of integrated transistor microwave generators. This limit in the OEO is caused by the bandwidth of an electrooptical modulator based on a lithium niobate crystal (LiNbO3). At present, the stationary mode of operation of OEO is well studied, but little attention is paid to the study of the process of its self-excitation. Therefore, the purpose of this work is a mathematical description of the process of self-excitation of an optoelectronic autogenerator.
This paper presents the results of a theoretical study of a fiber-optic delay line with an electro-optical modulator. On the basis of this line, radio-photon generators and frequency converters of microwave signals are performed. The results of experimental studies of such radio-photon devices are also given in this paper.
This article presents a theoretical calculation of a radio photon mixer using the methods of spectral analysis of signals and the results of an experimental study of the spectral composition of optical signals in a radio photon mixer. An experimental setup is presented, which consists of an optical source, two Mach-Zander modulators, an optical spectrum analyzer and auxiliary equipment for setting bias voltages and generating microwave signals. Expressions are obtained for determining the amplitude coefficients of the harmonic components in the spectrum of the signal of a radiophoton mixer at the output of the second electro-optical modulator. As a result of the experimental study, the amplitudes of the combination components in the optical spectrum at the output of the investigated mixer were determined.
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