| 摘要 |
An amplification medium is inputted thereto first lights and second lights, polarizations of which are orthogonal. A pumping means inputs first pump lights coinciding with the polarization of the first lights, and second pump lights coinciding with the polarization of the second lights to the amplification medium. The gain of a wavelength or wavelength band of a certain light can be efficiently controlled, simply and independently, without affecting the other wavelengths or wavelength bands.
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