Oleksin M. Influence of dispersion and nonlinear effects of optical fibre on the parameters of transport systems

Dissertation work is devoted research of optical transport networks with a wave length division multiplexing of ducting and methods of increase of efficiency of their functioning, the analysis of basic limiting factors of carrying capacity, analysis and research of nonlinear effects which take a place in such systems, is conducted, to experimental researches, measuring and design of jitter, polarization mode dispersion and bit error ratio. The model of an optical transport DWDM system which is based on a construction and analysis of eye-diagram and allows to get descriptions of quality of functioning for every spectral channel is in-process developed, depending on his descriptions. By the developed model dependence of high speed of transmission and length of regeneration area is investigational at the set coefficients of bit error. Also a model allows to optimize an optical transport system from point of minimization of influence of nonlinear effects on the coefficient of bit error. Measuring of differential group delay of signal is conducted in the optical light-pipes of the fiber-optics systems of transmission, the got results became basis for the subsystem of design of polarization mode dispersion. The chart of indemnification of PMD, which diminishes this type of dispersion in 1,7-5 times, is improved. Measuring of jitter is conducted, it is set that consists of determined and casual constituents, the method of minimization of influence of jitter is developed by the temporal change of point of making a decision about the accepted bit. The developed methods of optimization of parameters and minimization of influence of nonlinear effects, indemnification polarization mode dispersion and diminishing of influence of jitter allow to increase length of regeneration area and speed of passing to information, thus efficiency of the use of the offered solutions grows with the increase of speed of transmission, what allows to attain the primary purpose of work - increase of carrying capacity of the system.