Patent ID: 6687443
Filing Date: 2004-02-03
Classification: G02B,H04B

Abstract:
An optical transmission line, comprising:a first optical fiber comprising an entrance end for receiving signal light and an exit end for emitting said signal light, said first optical fiber having, as characteristics at a wavelength of 1550 nm, a first effective area Aeff1 and a first chromatic dispersion D1, and having a first length L1; a second optical fiber comprising an entrance end fusion-spliced to the exit end of said first optical fiber, and an exit end for emitting said signal light, said second optical fiber having, as characteristics at the wavelength of 1550 nm, a second effective area Aeff2 smaller than said first effective area Aeff1 and a second chromatic dispersion D2 different from said first chromatic dispersion D1, and having a second length L2 different from said first length L1; and an optical multiplexer optically coupled to the entrance end of said first optical fiber so as to supply Raman amplification pumping light to said first optical fiber together with said signal light, or optically coupled to the exit end of said second optical fiber so as to supply Raman amplification pumping light to said second optical fiber while transmitting therethrough the signal light emitted from said second optical fiber; wherein at least one of said first and second optical fibers has a core region substantially made of pure silica glass.