For long-distance data communication based on coherent optical transmission in single-mode optical fibres, the use of soliton pulses as information carriers has raised a large interest since the NLS soliton concept solution of the nonlinear Schroedinger equation in dispersive optical fibres by Hasegawa and Tappert and its first experimental verification by Mollenauer. High bit rate transmission capacity may be achieved by this technique if the minimum distance between solitons 5 to 10 times their width avoids the interaction between them. Recent experiments have demonstrated 1 soliton transmission over more than 4000 km in a nonshifted-dispersion single-mode fibre hereafter called n.d.-s.f. in which losses are periodically compensated by Raman gain, and over 9000 km in a dispersion-shifted fibre hereafter called d.-s.f. 2 generation and transmission of high-bit rate optical solitons up to a repetition rate f sub bit 20 GHz in dispersion-shifted fibres, losses being compensated by amplification in an Er3 - doped fibre, using a color-center laser, or a directly modulated distributed-feedback laser diode.
This article is from 'OSA Proceedings of the Topical Meeting on Nonlinear Guided-Wave Phenomena Held in 2-4 September 1991. Cambridge, England United Kingdom. Volume 15', AD-A253 471, p256-259.