Patent ID: 9577403
Date: 2017-02-21
CPC Classifications: H01S,H04B,H04J

Claim:
1. A method comprising: for an optical fiber span coupled between a first node and a second node, obtaining a first receive power measurement at the second node with a controlled optical source at the first node turned on and with a plurality of Raman pump lasers at different wavelengths at the second node turned off; obtaining a second receive power measurement at the second node with the controlled optical source at the first node turned on and the plurality of Raman pump lasers turned on to respective power levels to inject optical Raman pump power into the optical fiber span; obtaining a noise measurement at the second node with the controlled optical source at the first node turned off and the plurality of Raman pump lasers turned on to the respective power levels; computing a measured Raman gain based on the first receive power measurement, the noise measurement, and the second receive power measurement; and setting the respective power levels of the plurality of Raman pump lasers to bring the measured Raman gain closer to a target Raman gain.