Optical amplifier

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PROBLEM TO BE SOLVED : To provide a method, a system, and a device for optical communication. SOLUTION : An optical amplifier 300 comprises : a feed forward first amplification stage 303 including rare-earth doped fiber that receives an optical signal and introduction pump light; and a plurality of subsequent amplification stages each including corresponding rare-earth doped fiber. Each of the subsequent amplification stages receives a separately introduced part of remaining pump light from the first amplification stage 303, and the remaining pump light branches off to parts destined to the respective subsequent amplification stages. SELECTED DRAWING : Figure 3 COPYRIGHT : (C)2016, JPO&INPIT