Patent ID: 7586671

Claim:
A system for controlling Raman gain of an optical signal on a fiber span, the system comprising: an optical tap connected to an end fiber span; an optical coupler connected to the end of the fiber span; an optical power meter connected to the optical tap, wherein the optical power meter is configured to measure an optical power of the optical signal; a Raman gain control unit connected to the optical power meter, and a Raman pump laser connected to the optical coupler and the Raman gain control unit, wherein teh Raman pump laser is configured to produce a Raman pump power, wherein the Raman gain control unit is configured to read teh measured optical power of the optical signal from the optical power meter, and wherein the Raman gain control unit is further configured to adjust the Raman pump laser according to a factor multiplied by the measured optical power of the optical signal.