Dispersion compensation using chirped fiber Bragg gratings[ 1,2] is a very promising approach to long distance, high bit rate transmission over already installed nondispersion shifted fiber (NDSF), as chirped fiber gratings are passive, compact, fiber compatible and relatively easy to fabricate in large numbers. Recently, 10 Gbit/s transmission over 400 km of NDSF with a 10 cm chirped grating was achieved[3]. In that demonstration, the grating bandwidth, and hence maximum grating dispersion, was limited by the need to accommodate the signal bandwidth (>0.1nm). In this work, by using a reduced-bandwidth duobinary 10 Gbit/s transmitter, we show that transmission up to 700 km of NDSF is now achievable with a single 10 cm long chirped fiber grating. In addition, we find that to achieve these long distances, care must be taken with regard to the proper positioning of the compensating grating in order to minimise penalties arising from nonlinearity in the fiber. Experiment: The experimental configuration is shown in Fig. 1. The 1558.8 nm 10 Gbit/s

© 1996 Optical Society of America

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