Patent ID: 6388806
Filing Date: 2002-05-14
Classification: H01S,H04B,H04J

Abstract:
A multistage fiber amplifier system comprising:an input amplifier stage and an output amplifier stage each comprised of a rare earth doped fiber and each having an inherent gain profile over a given gain spectrum, said input amplifier stage receiving an input comprising a plurality of channel signals for amplification and together having a given input signal power; a first plurality of pump laser sources with outputs combined for providing pump power to said input and output amplifier stages; the combined pump outputs being split to pump the input and output amplifier stages; and upgradable pumping power provided to said input amplifier stage and said output amplifier stage to increase the pump power to said amplifier stages for maintaining the rare earth inversion levels and gain profiles in said amplifier stages when said input signal power to said input amplifier stage is increased or when an amount of signal channels provided to said input amplifier stage is increased.