Abstract

In lightwave analog transmission systems, erbium-doped fiber amplifiers (EDFAs) are very useful for compensating the transmission and branching losses. However, analog signal transmission over 1.3-μm-optimized single-mode-fiber in the wavelength region around 1.55 μm, which is coincident with the EDFA’s operating wavelength, causes serious degradation¹ in the distortion from the combined effects of laser chirp and fiber chromatic dispersion. To overcome this problem, electrical predistortion circuits² and dispersion-compensating fiber³ have been developed, but high-quality signal transmission cannot be realized for every subscriber because these are applied in the transmitter and are optimized for the specific transmission distance, although the transmission distances between the head end and the subscribers are different.

© 1995 Optical Society of America