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.
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.