Optoelectronic oscillator (OEO) output frequency stabilization in various use cases is urgent, especially for integrated photonics realizations. OEO environmental changes sensitivity limits the commercial use of this frequency generator type. In this article, we showed the application possibility of the tunable optical delay element for frequency stabilization. Also, we presented a mathematical model of the OEO with a tunable delay element for the output frequency control. We used Ansys Lumerical software for the mathematical model verification. The frequency tuning range is 2.6 GHz with a 50 MHz/ps frequency step.
The paper considers the study of chirped optical signal application methods in perspective optical networks: RoF, PON and MAN categories. The principle of obtaining chirped optical pulses due to Mach-Zehnder chirping modulator control modes selection is proposed. A mathematical model is developed. It is shown that iterative selection of corrective chirp function is possible. The experimental approbation of the proposed principle is performed. It is also shown that the chirp function can be used to design all-optical network control devices.
This article is dedicated to interface devices for all-optical synchronization of optical backbone and subscriber line network segments. It is obvious that this type of devices must be all-optical. Due to the importance of phaselock loop (PLL) circuits essential for each telecommunication device an all-optical circuit has been suggested which fundamental principle of operability is in phase cross-modulation effect between tuned and strobe optical signals. Physical parameters of the circuit and time of PLL execution have been calculated. It is shown that this response time is suitable for highspeed devices.
KEYWORDS: Waveguides, Radio optics, Antennas, Control systems, Fiber optics, Refractive index, Distortion, Phased arrays, Radio over Fiber, Phase shifts
The task of the antenna array radiation pattern optical control for ultra-wideband radio emission is considered in the paper. A fiber-optic phasing scheme is proposed, which is part of a complex fiber-optic device. The control device layout and the radio-photon segment layout photos are presented. An analytical model of the optical phasing process is developed that provides the frequency bands number calculation. The number of bands, on which a wide frequency range should be divided, depends on the permissible level of the array radiation pattern distortion. The results of experimental approbation of the radio lobe phasing control in the frequency band of 200 MHz, divided into 3 subbands of 70 MHz, are presented.
This paper describes objectives on inner pipeline fault detection device modeling designated to monitor pipeline in real time. Due to high demands to high-speed and miniature measurements of such devices it is suggested to use implementations on the basis of fiber optic and radio-photonic mode of operation. A functional equipment design containing fiber optic generation and complex optic impulses transformation transmitted into radio trunk circuits are developed. Physical implementation of the suggested model is estimated as well as an analytical model for propagation of pilot signal on the basis of the Maxwell system of equations for partially conductive and simultaneously scattering medium.
KEYWORDS: Control systems, Fiber optics, Refractive index, Radio optics, Signal attenuation, Antennas, Ultraviolet radiation, Radio over Fiber, Channel projecting optics, Telecommunications
This paper describes functional principles of a device for optical signal splitting and chirping. The offered device is to fulfill functions of such optical signal distortions compensation within FOCL RoF as linear attenuation (LA) and chromatic dispersion (CD); and it should also split optical signals for its feeding to radio emitting components, compounding aerial array (AA), and control radio emitting antenna lobe. In the meantime the device for optical signal splitting and chirping can inject losses into transferred signal, though they should be within tolerant values for conventional FOCL components.
KEYWORDS: Signal generators, Prototyping, Antennas, Telecommunications, Radio over Fiber, Modulators, Microwave radiation, Signal to noise ratio, Fractal analysis, Radio optics
Wireless part of the laboratory bench, implementing IR-UWB Radio-over-Fiber system, is described in the paper. Experimental prototype of fractal antenna radiating system (FARS) is considered, various transmission modes of the laboratory bench, which allow to investigate technical specifications, are described. Research results are presented and analyzed.
KEYWORDS: Radio optics, Instrument modeling, Optical amplifiers, Switches, Switching, Photography, Radio over Fiber, Systems modeling, Telecommunications, Fiber optics
This article examines the devices for optical signal splitting and chirping device modeling. Models with splitting and switching functions are taken into consideration. The described device for optical signal splitting and chirping represents interferential splitter with profiled mixer which provides allocation of correspondent spectral component from ultra wide band frequency diapason, and signal phase shift for aerial array (AA) directive diagram control. This paper proposes modeling for two types of devices for optical signal splitting and chirping: the interference-type optical signal splitting and chirping device and the long-distance-type optical signal splitting and chirping device.
KEYWORDS: Data transmission, Pulse shaping, Gaussian pulse, Radio over Fiber, Telecommunications, Transmitters, Antennas, Signal to noise ratio, Digital signal processing, Receivers
Experimental bench, which provides high-speed data transmission for IR-UWB Radio-over-Fiber systems on the basis of Gaussian pulses, is presented in the paper. Experiment setup and results are described and discussed.
The analysis of the influence of the physical layer concepts in optical networks on the performance of the whole network. It is concluded that the relevance of the search for new means of transmitting information on a physical level. It is proposed to use an optical chirp overhead transmission between controllers SDN. This article is devoted to research of a creation opportunity of optical neural switchboards controlled in addition by submitted optical radiation. It is supposed, that the managing radiation changes a parameter of refraction of optical environment of the device, and with it and length of a wave of information radiation. For the control by last is used multibeam interferometer. The brief estimation of technical aspects of construction of the device is carried out. The principle of using the device to an extensive network. Simulation of network performance parameters.
Clear nanocrystalline material receipt possibilities are described in the paper. We investigated the possibility to process the glass-ceramics and quartz by intense torsion under high pressure. We found that due to the lack of plasticity of the material zone to maintain the integrity of the sample it is necessary to apply heating up to 200-250°C. The resulting material is supposed to be used in fiber-optic telecommunication systems. We conducted mathematical modeling of the refractive index in the linear and nonlinear mode capacities for nanostructured glass-ceramics. The analytical method is based on the strain oscillator motion under outer light wave effect model. We also found the coefficient of nonlinear stiffness for nanostructured glass-ceramics.
KEYWORDS: Modulators, Signal generators, Radio over Fiber, Photodiodes, Continuous wave operation, Modulation, Signal detection, Eye, Terahertz radiation, Optical amplifiers
Ultra-wideband (UWB) signal generation approach for Radio-over-Fiber (RoF) systems is proposed in the paper. Impulse-radio ultra-wideband (IR-UWB) transmission technology experimental realization comply with State Committee on Radio Frequency (SCRF) regulations is offered in the paper. Three separate IR-UWB signals with carrier frequencies 4,5 GHz, 7 GHz and 9,5 GHz are generated. Such frequencies were chosen because of SCRF spectral mask "windows". The frequencies 4,5 GHz, 7 GHz and 9,5 GHz are the central frequencies of these "windows". To assess the performance of proposed system bit error rate (BER) measurements were taken.
UWB signal generation schemes and received IR-UWB signal are shown in the figures. The correlation between BER and received optical power is given in the paper. In the case of UWB signal photonic generation approach the correlation between BER and received optical power for different SMF fiber lengths is given.
The device for positive chirping of a signal in a fiber optical line is offered. The device is based on two Fabry–Perot resonator with additional fiber optical cannels. If to execute the amalgamator from an erbium doped material, the device will supply amplification of a target signal, which is important for distribution access systems (for example, Radio-over- Fiber systems (RoF)). The device provides selectivity for spectral components of entrance radiation, that allows to operate of chirp. Built-in the converter of length provides in additional fiber optical cannels tuning the chirp under the given size.
The article is devoted to the research of a method providing positive chirp of a signal on a long-haul fiber optic line. The modeling of an optical pulse duration and its chirp functions on an offered segment has allowed to estimate the parameters of a segment – distance between regeneration points and capacity level of additional radiation. The method is interesting for high-speed transmission when there is no availability to use the electronic or fiber optic chromatic dispersion compensation modules.
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