The nonlinear Fourier transform (NFT) is a potentially promising way to mitigate nonlinear signal distortions in fiber-optic communication systems [1-4]. Recently, the new approach named the b-modulation was introduced  that allows to control the temporal duration of NFT-generated signals. In the “traditional” NFT-based communication, the nonlinear spectrum, r(ξ) is used to modulate data. Then the signal duration depends on the signal energy and is not predetermined and controlled. The utilisation of the NFT scattering coefficient b(ξ) gives a possibility to control the pulse duration in time domain under condition that the Fourier spectrum of b(ξ) is localized.
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