| 摘要 |
A first wavelength converter of a wavelength-conversion device includes: an optical amplifier amplifying an incident light beam; a first dispersion flat fiber spreading the wavelength spectrum width of the amplified beam; and a first wavelength filter transmitting a predetermined wavelength bandwidth of the first fiber output beam. A center wavelength of the first wavelength converted beam is shifted by &Dgr;λ1 from that of the incident light beam. A second wavelength converter of the device does not include an optical amplifier and includes: a second dispersion flat fiber spreading the wavelength spectrum width of the first wavelength converted beam; and a second wavelength filter transmitting a predetermined wavelength bandwidth of the second fiber output beam. A center wavelength of the second wavelength converted beam is shifted by &Dgr;λ2 from that of the first wavelength converted beam. The &Dgr;λ1 and &Dgr;λ2 satisfy &Dgr;λ1+&Dgr;λ2=&Dgr;λ, &Dgr;λ1×&Dgr;λ2<0, and |&Dgr;λ1|<|&Dgr;λ2|. |
