Patent ID: 6927896
Filing Date: 2005-08-09
Classification: H04B

Abstract:
1. A Raman optical amplification system configured to amplify WDM optical signals in at least two different signal bands while the WDM optical signals are transmitted in an optical transmission media, comprising: a pump source configured to produce a plurality of pumping lightwaves that are introduced into said optical transmission media, an interval between a longest pumping wavelength and a next-longest pumping wavelength of said plurality of pumping lightwaves differing in frequency in an inclusive range of 0.2 through 1.4 THz, wherein a subset of said WDM optical signals that are in a shortest signal band of said at least two different signal bands are Raman-amplified by said plurality of pumping lightwaves, a gain profile of a pump for said longest pumping wavelength having at least one of a ripple and a trough in another signal band, other than said shortest signal band, and a gain profile of a pump for said next-longest pumping wavelength having at least one of a trough and a ripple that is positioned at a wavelength so as to substantially cancel a local minimum or local maximum gain effect in the another signal band caused by said at least one of a ripple and a trough from said pump for said longest pumping wavelength.