Multiple pumped fiber amplifiers for WDM communication systems with adjustment for the amplifier signal gain bandwidth

摘要

A WDM communication system utilizes a pump-mediated gain- shaped fiber amplifier having a predetermined nominal signal gain bandwidth and is pumped by a plurality of laser pump sources having different wavelength outputs with their outputs combined to provide a scaled power output of a weighted average of their wavelengths for launching into at least one end of the fiber amplifier. The weighted average of the output wavelengths of the individual sources is varied to produced a modified weighted average that broadens the predetermined nominal signal gain bandwidth. The wavelength weighted average of the combined pump sources may be modified by changing the operation of at least one of the pump laser sources, e.g., by changing the power level or the temperature level of one or more of the individual pump sources or by terminating the operation of one or of the individual pump sources. The amplifier may then be employed in a multiple channel DWDM communication system with broadened signal gain bandwidth permitting the expansion of the number of possible communication channels utilized with the amplifier.