Combining the Discrete NFT Spectrum with B-Modulation for High-Efficiency Optical Transmission

Summary form only given. Nonlinear Fourier transform (NFT) has attracted in the past several years a renewed interest as a potential tool for mitigation of nonlinear signal distortions in optical communications [1]. The NFT exploits the integrability of the master equation for the signal evolution in the optical fibre - nonlinear Schroedinger equation (NLSE). The NFT maps the solution of the NLSE to the domain of the complex-valued spectral parameter ξ, the nonlinear analogue of frequency. The complete set of nonlinear spectral data contains continuous functions α(ξ), b (ξ), and discrete spectrum, consisting of two complex-valued parameters for each discrete degree of freedom: eigenvalue ξ
_eig
, IM ξ
_eig
> 0, and spectral amplitude C(ξ
_eig
) associated to a discrete soliton eigenvalue [1]. In this work, we combine the modulation of continuous σξ function, and, additionally, modulate the solitonic degrees of freedom, i.e. the discrete part of the NFT spectrum - the soliton phase.