| 摘要 |
<p>A first WDM signal light generated by wavelength-division-multiplexing optical signals having wavelengths in a first band and a second WDM signal light generated by wavelength-division-multiplexing optical signals in a second band different from the first band are sent out on an optical fiber transmission line. The first and second WDM signal lights are amplified by first and second optical amplifiers, respectively. The spectra of the amplified first and second WDM signal lights are measured. On the basis of the measured spectra, the levels of the optical signals of the first and second WDM signal lights and the gains of the first and second optical amplifiers are adjusted. By the method, simultaneous pre-emphasis for the first and second bands can be conducted, and the influence of the energy transition by the Raman effect can be absorbed, thereby realizing wide-band pre-emphasis.</p> |
