US 2002/0154386 A1 · Optical transmission system

Abstract

An optical transmission system is provided in which a plurality of Raman amplifiers are combined so that the wavelength band of a first Raman amplifier in the form of an upward convex curve including the maximum gain value and the wavelength band of a second Raman amplifier in the form of a downward convex curve including the minimum gain value overlap with each other, and that the wavelength band of the first Raman amplifier in the form of a downward convex curve including the minimum gain value and the wavelength band of the second Raman amplifier in the form of an upward convex curve including the maximum gain value overlap with each other. This arrangement also applies to cases where three or more amplifiers are used. Due to this arrangement, an optical transmission system is realized in which it is possible to attain a reduction in Raman gain flatness without using any means such as an equalizer.

Claims5

Dependent claims

An optical transmission system, wherein:

a plurality of Raman amplifiers in cascade with each other including a plurality of pump light sources of different pump wavelengths are used;
said plurality of Raman amplifiers have their several optical fibers where stimulated Raman scattering is generates;
said Raman amplifiers mutually compensate for their wavelength dependence of Raman gain;
and the total Raman gain flatness is smaller than the cumulative flatness on the assumption that every amplifier has the same gain profile of one of said Raman amplifiers.

1 more element

Dependencies are inferred from the claim text.

Optical transmission system

Life of this patent

Optical transmission system

Life of this patent

Abstract

Claims5