We propose a method for increasing the speed and spectral efficiency of information transmission over soliton communication lines, based on algorithms for solving inverse and direct scattering problems, in the frame of a modern soliton orthogonal frequency division multiplexing (SOFDM) approach. The proposed method uses a simultaneous phase and frequency coding. This phase-frequency coding method retains all the technological advantages of the SOFDM method, and due to the additional frequency coding, a noticeable increase in the information transfer rate over the soliton optical lines is expected. Numerical modeling confirmed the proposed method for telecommunication applications' prospects.
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