Abstract
Due to the inherently nonlinear nature of optical fibres, the increased demand for transmission capacity means that fibre optic communication systems will reach a limit, known as the Linear Capacity Limit [1,2]. A radically new solution has received significant attention in the past few years [1,3,4], which is based on Nonlinear Fourier Transform (NFT) [5]. Under NFT a signal q(t) in time domain transforms into a continuous, qc(λ), and a discrete, qd(λk), complex spectral part, with continuous and discrete eigenvalues λ, and λk, respectively [4]. Considering only multisolitons (a class of optical signals that have discrete NFT eigenvalues), it is well-known that 1) complex eigenvalues λk are invariant, and 2) the spectral part propagates as: $q^{d}_{k}(z) = \vert q^{d}_{k}(0) \vert e^{j \Phi (z)}; \Phi (Z) = \angle q^{d}_{k}(0) - 4 \lambda^{2}_{k}z,$
Published Version
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