Оmеtsyns'ka N. Capacity growth of fiber-optical baseband transmission paths on the single-mode light guides

The РhD thesis is devoted to the creation of models of fiber-optical baseband transmission paths with the boosted transmission capacity - by use: mathematical modeling of the single-mode light guides (SMLG) with the improved transfer characteristics; methods of broadband compensation of a chromatic dispersion; the dispersion cards for baseband transmission paths with dispersion self-compensation. Features of joint behavior of spectral dependences of transfer characteristics of an optic fiber are opened. Use of these features in problems of the analysis and synthesis of SMLG boosts efficiency of navigation of design data of a fiber with the improved transfer characteristics. With use of computer programs which realize the offered methods of the analysis and synthesis SMLG, characteristics of new broadband optical fibers with the improved parameters are developed and designed. The developed analytical expression is received, with its use the form and a phase of an optical impulse with an initial linear frequency modulation is investigated, at movement of an impulse along a fiber. It is proved - in the presence of dispersion self-compensation in the linear optical path constructed on sequence of fibers with dispersions of opposite characters, takes place as well full compensation of a frequency modulation of a moving impulse. The offered method of calculation of limiting of a system dispersion allows to consider such factors: a frequency modulation of an input pulse and its form; spectral width of a source of optical radiation and effective width of modulation; NRZ or a RZ-signal. Existence of the best value of parameter of a linear frequency modulation is proved - the maximum value of system dispersion is thus provided.