Simulation of the Soliton Propagation in Optical Fibers with Various Methods of Signal Amplification

This paper describes numerical experiments on modeling the propagation of pulse sequences in optical fibers of type G.655 when using lumped and distributed methods of signal amplification. It is shown that the mutual influence of pulses in the transmitted sequence decreases if distributed signal amplification with bidirectional pumping power is used to compensate for signal power losses in optical fibers. The expediency of using optical fibers of G.655 type in soliton transmission lines is substantiated. By means of simulation results it can be concluded that the use of distributed amplification with bidirectional pumping allows increasing the length of compensated sections up to 100 km with no degradation of signal quality when building soliton transmission lines with optical fibers of G.655 type. The numerical solution for this problem was found using the nonlinear Schrödinger equation, which considers both the signal power loss and the signal gain using different pumping techniques. Numerical modeling was performed using the Fourier method of splitting by physical factors. The MATLAB package of applied programs, designed for solving problems of technical calculations, was used in this work.