| 摘要 |
In an optical fiber transmission line between two terminal stations, an input side wavelength converter for up-shifting a wavelength of a signal light is inserted at a front part of each of the optical amplifiers and an output side wavelength converter for down-shifting a wavelength of a signal light is inserted at a rear step of the optical amplifiers. Signal lights transmit in a wavelength band shorter or longer than the zero dispersion wavelength of the transmission optical fiber on said transmission optical fibers. The input side wavelength converter converts the wavelength of the signal lights from the transmission optical fibers within the amplifying bandwidth of the optical amplifiers and the output side wavelength converter returns the wavelength of the signal lights optically amplified by the optical amplifiers. |
