Abstract

NRZ-signal transmission systems at 20 Gbit/s have been intensively investigated for future trunk line systems, because of their simple system configuration and each integration.^1,2 However, large positive chromatic dispersion limits the transmission distance when a 20-Gbit/s signal is transmitted through a standard fiber at a 1.55-μm wavelength. Dispersion-compensating fiber (DCF) is a simple and effective device for canceling the transmission-line dispersion.³ For designing the systems using DCF, the compensation ratio and the transmitting power must be carefully determined, because the dispersion and the fiber nonlinearity severely narrow the available operating range at 20 Gbit/s. In this paper system parameters are discussed for 125 km of standard fiber at 20 Gbit/s.

© 1995 Optical Society of America