Abstract

Cascaded EDFAs have made it possible to transmit 10-Gbit/s signals over thousands of kilometers of dispersion-shifted fiber (DSF) (see, for example, Refs. 1 and 2). However, the severe dispersion of conventional fibers still limits the transmission to distances that are far shorter than those obtainable with DSF. To overcome the dispersion limit, various techniques have been examined; for example, dispersion-compensation fiber (DCF) has been used for 360-km conventional- fiber transmission,³ dispersion-supported transmission has been used for 253-km transmission,⁴ and spectrum inversion has been used for 560-km transmission.⁵ In this paper we demonstrate the feasibility of 10-Gbit/s transmission over more than 2000 km of conventional fiber by using dispersion-compensated fibers in a recirculating loop.

© 1995 Optical Society of America