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We report on a repeaterless transmission of 2 X 2.5 G bits /s, 2nm spaced WDM channels over 250 km of dispersion-shifted fiber (DSF) using, as light sources, directly modulated DFB lasers. Back-to-back sensitivity was compared with 125 km and 250 km of transmission throught DSF, for different transmitter power levels, and no significant power penalty was observed.

5 GBIT/S (2 X 2.5 GBIT/S) Repeaterless WDM Transmission Over 250 KM of Dispersion-Shifted Fiber Using Direct Modulation