Dispersion-Managed Solitons for Terrestrial Transmission

We describe a scheme involving the insertion of segments of dispersion compensating fiber, pumped to yield Raman gain, at one or more intermediate points within each 80 km or greater span between amplifier huts. With dispersion-managed solitons, the scheme allows for error-free, dense WDM (many channel wavelength division multiplexing), with high spectral efficiency, over transmission distances of many thousands of kilometers.