Patent ID: 6904064

Claim:
A Raman gain control method of controlling a Raman gain caused by simultaneous application of pump lights of several wavelengths to an optical fiber, comprising the steps of: on a model transmission line, obtaining a value of each power of each said pump light realizing a designated Raman gain within a designated wavelength range, with respect to each of said model transmission line and a transmission line as an application destination, obtaining a value of Raman gain slope generated by application of each said pump light, with respect to each said pump light, calculating a value obtained by multiplying power of pump light in question realizing said desired Raman gain on said model transmission line by a ratio indicative of how many times the value of said Raman gain slope of the pump light in question on said model transmission line is the value of said Raman gain slope of the pump light in question on said transmission line as an application destination, and controlling power of each said pump light applied to said transmission line as an application destination to apply each said pump light at the power of each said calculated value, thereby realizing, on said transmission line as an application destination, said designated Raman gain the same as the gain of said model transmission line within said designated wavelength range.