Exact Solution of the Zakharov-Shabat Scattering Problem for Doubly-Truncated Multi-Soliton Potentials
This work addresses the windowing problem for multi-soliton signals in fiber optic communications, offering a theoretical tool for analyzing nonlinear Fourier transform-based transmission systems.
The paper provides an exact solution to the Zakharov-Shabat scattering problem for doubly-truncated multi-soliton potentials, enabling accurate quantification of time-domain windowing effects on the nonlinear Fourier spectrum without prohibitive numerical computations.
Recent studies have revealed that multi-soliton solutions of the nonlinear Schrödinger equation, as carriers of information, offer a promising solution to the problem of nonlinear signal distortions in fiber optic channels. In any nonlinear Fourier transform based transmission methodology seeking to modulate the discrete spectrum of the multi-solitons, choice of an appropriate windowing function is an important design issue on account of the unbounded support of such signals. Here, we consider the rectangle function as the windowing function for the multi-solitonic signal and provide the exact solution of the associated Zakharov-Shabat scattering problem for the windowed/doubly-truncated multi-soliton potential. This method further allows us to avoid prohibitive numerical computations normally required in order to accurately quantify the effect of time-domain windowing on the nonlinear Fourier spectrum of the multi-solitonic signals. The method devised in this work also applies to general type of signals and may prove to be a useful tool in the theoretical analysis of such systems.