Currently, fiber-optic communication becomes increasingly important in the industry. However, to ensure high data rates it is crucial to overcome the negative effects of material dispersion caused by the dependence of the phase velocity of a wave on its frequency. Phase dispersion in optics causes the spatial separation of a light pulse into components with different group delay. In our studies we applied an approach that allowed to model the propagation of an optical pulse throughout the fiber by an equivalent linear system with frequency dispersion and its associated frequency and impulse responses. Paper presents the findings of the research into the effect of changing dispersion parameters on optical pulse distortions by increasing the length of the fiber with the third-order and the second-order material dispersion.
The paper presents the findings of the research into the effects of material dispersion in an optical fiber link. The general framework of normal and anomalous dispersion of the second and third orders were formulated by means of a principle of equivalence. The approach to the problem is based on a method of transforming a frequency response of an equivalent liner system into its impulse response with the use of a dispersion characteristic. This approach was used to thoroughly consider the effects of chirping, soliton (stable) propagation and collapse of solitons.
In the study there was carried out the analysis of the daily dynamics of the TEC, the intensity of variations changes and seasonally analysis of TEC variations for Yoshkar-Ola and Irkutsk, according to 2012.
It is carried out the analysis of number of solar flares changein the work and their impact on the intensity changes of TEC variations for Yoshkar-Ola city according to the 2012 and 2015 years.
The paper presents the algorithm and software for plotting coherence bands maps of transionospheric radio channels using NavGeoKom network stations data. The results of full-scale experiments of mapping for various regions of the Russian Federation are shown.
Paper shows a method for plotting the electron concentration profile of the ionosphere on the basis of a joint approach using oblique and transionospheric sounding data. The method of determining the profile up to the global maximum height is based on the reconstruction of oblique sounding ionograms. Above the maximum, an exponential layer model is used, the initial parameters of which are transionospheric sounding data.
The equations were obtained to estimate the pulse power losses of broadband light pulses caused by material dispersion in an optical fiber. It was found that the dispersion caused by the extension of a signal bandwidth leads to decreasing a signal base as well as the noise immunity of a system, which uses broadband pulses.
The paper discusses the questions of creating a mathematical model for studying the extension of a broadband pulse caused by material dispersion of an optical fiber while matched compression is also taken into account. It was shown the dependence of the dispersion widening of optical broadband signal on the optical fiber material dispersion coefficient. It was established that we can neglect dispersion impact in the case when the pulse frequency band is less than the coherence band of an optical fiber.
Technique of research the dispersion distortion of wideband chirp signal elements was proposed and theoretically justified. It is shown that in a first approximation, the difference frequency element signal assumes a linear frequency modulation. A formula that relates the rate of change of frequency characteristics of the signal and the dispersion properties of the medium was derived.
This paper focuses on the technology of compression of light pulse in an optical fiber. Investigated the effects of compression and decompression of the optical linear chirp pulse and define the parameters of optimal pulse. Simulated the rectangular chirp light pulse at different ratios between the parameters of the phase and frequency change.
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