Effects of Fluctuations in Dispersion of Transmission Lines on Optical Eigenvalue Communication

Optical eigenvalue communication [1] based on the nonlinear Fourier transformation (NFT) is a promising technology to overcome the Kerr nonlinear limit and realize high capacity fiber optic transmission. To increase the transmission capacity, many studies have been conducted on multilevel and multieigenvalue modulations based on the NFT [2]. However, an inter-symbol interference (ISI) induced by dispersion is one of the main impairments that limit the transmission distance in the eigenvalue communication system [3]. Non-zero dispersion-shifted fibers (NZ-DSFs) with a small dispersion parameter $D_{ND}$ are useful to suppress the ISI and extend the transmission distance. However, the longitudinal fluctuation of dispersion parameter caused by the fiber manufacturing process [4] should be considered because the relative variation increases for a small $\vert D\vert$ . In this study, we evaluate the effect of the longitudinal fluctuation of the dispersion parameter $\Delta D(Z)$ on the eigenvalue transmission by numerical simulations.