| 摘要 |
An optical wavelength multiplex transmission apparatus includes a demultiplexer ( 12 ) that divides a wavelength-multiplexed optical signal into optical signals of individual wavelengths, an optical attenuation control portion ( 13 ) that performs an optical attenuation control so that levels of the optical signals of individual wavelengths become constant, a multiplexer ( 16 ) that combines the optical signals of individual wavelengths after the optical attenuation control and multiplexes them, an optical signal level storing portion ( 15 ) that stores a first level range of optical signal levels, and an optical attenuation control stopping portion ( 22 ) that decides whether or not a level of each of the optical signals of individual wavelengths is within the first level range obtained from the optical signal level storing portion ( 15 ), and if its level is within the first level range, stops the optical attenuation control for an optical signal of a wavelength having the level.
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