Partitioning type distributed optical fiber signal amplification method

The invention discloses a partitioning type distributed optical fiber signal amplification method, and relates to the technical field of optical fiber transmission, in particular to a novel partitioning type distributed optical fiber amplification technology. Signal light and second-order Raman pump light are input together from the front end of an optical fiber, Brillouin pump light and first-order Raman pump light are input together from the tail end of the optical fiber, the whole optical fiber serves as a transmission medium and also serves as an amplification medium; signal pulse light in the first segment of the optical fiber and signal pulse light in the third segment of the optical fiber are amplified mainly by a Raman pump, the third segment of the optical fiber will not have the stimulated Brillouin effect, the Brillouin pump light will be amplified by a backward Raman pump, Brillouin pump energy is pushed to the second segment of the optical fiber, and signal light in the second segment of the optical fiber is amplified mainly by the Brillouin pump light with a much higher gain coefficient. Thus, the signal light in the whole optical fiber is amplified in a distributed mode, and the effects of prolonging the transmission distance of the optical fiber and improving the strength of transmission signals of the optical fiber are achieved.