210-KM REPEATERLESS 10-GB S TRANSMISSION EXPERIMENT THROUGH NONDISPERSION-SHIFTED FIBER USING PARTIAL-RESPONSE SCHEME/

In order to increase the dispersion-limited propagation distance at 10 Gb/s through nondispersion-shifted fiber, a chromatic dispersion tole rant signalling technique is used, based upon a reduced optical signal bandwidth. We have achieved a 210 km repeaterless transmission distan ce at 10 Gb/s over nondispersion-shifted fiber with a measured bit err or ratio lower than 10(-12). At this distance, a receiver penalty of 1 .7 dB was obtained at 10(-10) bit-error ratio, while an almost penalty -free transmission has been performed through 189 km. The technique re laxes the bandwidth requirements for the optoelectronic components at the transmitter level and involves a standard 10 Gb/s receiver at the output end of the transmission link.