Optical amplifier

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An optical amplifier comprising an optical amplification medium added with a rare earth element and having an incident end and an exit end with L-band signal light impinging on the incident end, a first light source generating first light for exciting the amplification medium, a second light source generating second light for accelerating radiation in the amplification medium, a multiplexer for multiplexing the first light and the second light, and a section for supplying multiplexed light from the multiplexer to the incident end or the exit end.