| 摘要 |
6446-431 A wavelength-division multiplex transmission system includes an optical multiplexer for multiplexing optical signals having different wavelengths into a wavelength-division multiplexed optical signal. Also included are optical amplifiers for amplifying, as a whole, the wavelength-division multiplexed optical signal supplied from the optical multiplexer, and an optical filter for suppressing undesired spectra of an output optical signal supplied from the optical amplifiers. The system removes spontaneous emission noise produced in the amplifiers. |
