Patent ID: 6671083
Filing Date: 2003-12-30
Classification: H01S,H04B

Abstract:
A Raman amplifier supplying excitation lights to an amplifying medium on an optical transmission path through which signal lights are propagated, to Raman amplify the signal lights being propagated through said amplifying medium,wherein, when a wavelength band of the excitation lights has a region overlapped with a wavelength band of the signal lights, said Raman amplifier comprises an excitation light wavelength suppressing unit capable of suppressing optical components which are included in lights propagated through said amplifying medium and are of the same wavelengths as those of the excitation lights within the region overlapped with the wavelength band of the signal lights, wherein, when said optical transmission path is a hybrid transmission path including a first fiber having a positive wavelength dispersion and a positive dispersion slope relative to a wavelength band of the signal lights and a second fiber having a negative wavelength dispersion and a negative dispersion slope relative to the wavelength band of the signal lights, and the signal lights are supplied so as to be propagated through said first fiber and said second fiber sequentially, said excitation light wavelength suppressing unit is arranged on said first fiber.