Abstract: An optical regeneration system for regenerating a degenerated signal light, comprising a regeneration device having at least one of a soliton converter, a pulse roller, a Kerr-shutter and a soliton purifier. The solilton converter uses an anomalaous-dispersion fiber (ADF) having a fiber length up to three times the soliton frequency, and the pulse roller is provided with a pulse roller fiber having high non-linear characteristics. The Kerr-shutter comprises an optical LO (local oscillation) generator for generating an optical LO on an OPLL (optical phase locked loop), a phase comparator for detecting the phase difference between an externally-input signal light and an optical LO, and a control unit for regulating the repeated frequency of an optical LO based on the phase difference. The soliton purifier has a soliton fiber disposed between two optical fibers.

Abstract: An optical regeneration system for regenerating a degenerated signal light, comprising a regeneration device having at least one of a soliton converter, a pulse roller, a Kerr-shutter and a soliton purifier. The solilton converter uses an anomalous-dispersion fiber (ADF) having a fiber length up to three times the soliton frequency, and the pulse roller is provided with a pulse roller fiber having high non-linear characteristics. The Kerr-shutter comprises an optical LO (local oscillation) generator for generating an optical LO on an OPLL (optical phase locked loop), a phase comparator for detecting the phase difference between an externally-input signal light and an optical LO, and a control unit for regulating the repeated frequency of an optical LO based on the phase difference. The soliton purifier has a soliton fiber disposed between two optical fibers.

Abstract: An optical fiber wavelength converter inputs signal light and pumping light into an end of the highly nonlinear optical fiber to obtain converted light of the signal light from the other end of the highly nonlinear optical fiber. In the optical fiber wavelength converter, a wavelength ?p of the pumping light is set within a range from ?0?1 nanometers to ?0+1 nanometers, where ?0 is a zero-dispersion wavelength of the highly nonlinear optical fiber, an absolute value of a dispersion slope of the highly nonlinear optical fiber with the wavelength ?p is not more than 0.02 ps/nm2/km, a nonlinear coefficient ? of the highly nonlinear optical fiber with the wavelength ?p is not less than 10/W/km, and a change in a conversion bandwidth D defined as D=|?p??s2| is not more than 30 percent at variable environmental temperatures ranging from 0° C to 40° C.

Abstract: An optical regeneration system for regenerating a degenerated signal light, comprising a regeneration device having at least one of a soliton converter, a pulse roller, a Kerr-shutter and a soliton purifier. The solilton converter uses an anomalaous-dispersion fiber (ADF) having a fiber length up to three times the soliton frequency, and the pulse roller is provided with a pulse roller fiber having high non-linear characteristics. The Kerr-shutter comprises an optical LO (local oscillation) generator for generating an optical LO on an OPLL (optical phase locked loop), a phase comparator for detecting the phase difference between an externally-input signal light and an optical LO, and a control unit for regulating the repeated frequency of an optical LO based on the phase difference. The soliton purifier has a soliton fiber disposed between two optical fibers.

Abstract: An optical fiber wavelength converter inputs signal light and pumping light into an end of the highly nonlinear optical fiber to obtain converted light of the signal light from the other end of the highly nonlinear optical fiber. In the optical fiber wavelength converter, a wavelength ?p of the pumping light is set within a range from ?0?1 nanometers to ?0+1 nanometers, where ?0 is a zero-dispersion wavelength of the highly nonlinear optical fiber, an absolute value of a dispersion slope of the highly nonlinear optical fiber with the wavelength ?p is not more than 0.02 ps/nm2/km, a nonlinear coefficient ? of the highly nonlinear optical fiber with the wavelength ?p is not less than 10/W/km, and a change in a conversion bandwidth D defined as D=|?p??s2| is not more than 30 percent at variable environmental temperatures ranging from 0° C to 40° C.