PROPERTIES OF TEMPORARY OPTICAL SOLITONS IN OPTICAL FIBERS AND THE POSSIBILITY OF THEIR USE IN TELECOMMUNICATIONS. PART 3

In the third part of the paper, a theoretical study of the propagation processes of pulses having the form of hyperbolic secant has been carried out using special single-mode optical fibers with decreasing chromatic dispersion. Simulation has shown that the soliton regime is maintained at the longitude at considerable distances even in the presence of losses in the special fibers, which are compensated by discrete optical amplifiers. Using the simulation, it is also shown that instead of special fibers, several series-connected optical fibers can be successfully used with discretely decreasing group velocity dispersion (GVD). Quasi-soliton fiber-optic communication systems are also theoretically considered, in fiber-optic linear paths of which sections consisting of two optical fibers with different signs of GVD are used. And the residual GVD in the section has a negative sign. This allows, in combination with an op-amp, to realize a quasisoliton mode of operation in the fiber-optic linear path. Quasisoliton pulses are also called solitons with a controlled dispersion. Calculations and modeling using the OptiSystem allowed obtaining engineering formulas and recommendations for designing quasi-soliton fiber-optic communication systems.

optical soliton, temporary optical soliton, single-mode optical fiber, fiber optic communication system, group velocity dispersion, self-phase modulation, optical fiber with decreasing chromatic dispersion, optical amplification, solitons with a controlled dispersion, simulation

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