| 摘要 |
In an optical amplifier 8 or 10, multiplexed light beams inputted to an optical amplifying medium 19 are guided and the optical amplifying medium 19 is excited by an exciting source 21 to change the mu-factor. Part of multiplexed light beams amplified by the optical amplifying medium 19 are branched by an optical coupler, only a probe light beam is separated from the branched multiplexed light beams by means of a light separating unit 24, and the probe light beam is detected by a light receiving unit 28. A controller 29 controls an amount of operation of the exciting source 21 on the optical amplifying medium 19 such that an output of the light receiving unit 28 (an output of the probe light beam) becomes constant, thereby controlling the output of the probe light beam and the outputs of the multiplexed signal light beams to constant values. By using the optical amplifier 8 or 10 constructed as above, an optical amplifier can be provided which can control individual wavelength outputs without greatly affecting the signal transmission even when the number of signal wavelengths to be multiplexed changes and an optical transmission system using the optical amplifier can also be provided.
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