The method for selecting multi-pump in broadband fiber Raman amplifiers

The relation between the possible gain profiles with multiple pumps in Raman amplifiers is studied. A gain array is exported when the pump-to-signal and pump-to-pump Raman scattering are taken into account. The gain array is a discrete gain profile, whatever Raman gain profiles are, the gain array is acquired correspondingly. On the other hand, the power and wavelength of pumps can form a coordinate 2-dimensionally, the range of which is so limited that the coordinate must be chosen as many as possible until the gain array is found. The group of coordinate is the optimization of multiple pumps.