Patent ID: 6704134
Filing Date: 2004-03-09
Classification: H01S,H04B

Abstract:
An optical amplifier, comprising:a first pumping light source for Raman amplification, which outputs a first pumping light having a first wavelength; a second pumping light source for Raman amplification, which outputs a second pumping light having a second wavelength; and a wavelength multiplexer for Raman amplification, which allows said first and second pumping lights to be incident on an optical fiber transmission path where a signal light propagates, wherein said signal light is Raman amplified in said optical fiber transmission path by said first and second pumping light, wherein said signal light is a wavelength division multiplexed signal light (a WDM signal light), in which the signal lights having a plurality of wavelengths different from each other are wavelength division multiplexed. wherein said first wavelength is the wavelength to allow said signal to be Raman amplified such that the wavelength having a gain by Raman amplification as a peak becomes shorter than the wavelength of the signal light included in said WDM signal light, and said second wavelength is the wavelength to allow said signal light to be Raman amplified such that the wavelength having the gain by Raman amplification as a peak becomes longer than the wavelength of the signal light included in said WDM signal light.