OPTICAL AMPLIFIER AND ITS GAIN CONTROLLING METHOD

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An optical amplifier comprising input monitor means (2a, 3a) for outputting an input monitor signal obtained by monitoring the input light entirely using a rare earth element doped fiber (1) as an amplification medium, output monitor means (2b, 3b) for outputting an output monitor signal obtained by monitoring the output light entirely. The optical amplifier is further provided with an ASE compensation circuit (7) for compensating the spontaneous emission light (ASE) component included in the entire output light monitor signal, a gain variation level compensation circuit (9) for calculating a target average set gain determined dependent on the intensity of the input monitor signal, and a gain constant control circuit (8) performing gain control based on an output signal from the ASE compensation circuit (7) and a target average set gain outputted from the gain variation level compensation circuit (9).