Patent ID: 7391559

Claim:
A processor-readable medium having processor-executable instructions that, when executed by a processor, cause the performance of: transmitting a first Raman pump signal at a first wavelength in a fiber span via a first Raman pump laser; measuring a first gain of an optical signal due to the first Raman pump signal; turning off the first Raman pump laser; transmitting a second Raman pump signal at a second wavelength in the fiber span via a second Raman pump laser; measuring a second gain of the optical signal due to the second Raman pump signal; calculating a loss ratio based at least in part on a first coupling loss due to the first Raman pump signal and a second coupling loss due to the second Raman pump signal; and adjusting a power of at least one of the first or second Raman pump lasers in accordance with the calculated loss ratio to achieve a desired Raman gain spectrum.