Optical transmission systems using optical amplifiers and wavelength division multiplexing

摘要

An optical amplifier for a multi-channel optical transmission system is disclosed. A gain region of an optical amplifier is split into a forward path and a reverse path, each path being associated with a continuous transmission band. At least two first band signals are directed over the forward path and at least one second band signal is directed over the reverse path according to a wavelength of said respective signals. The wavelengths of the at least two first band signals are selected to have substantially similar gain tilt values.