Orthogonal double pumping-based optical fiber brillouin amplifier

The invention aims to solve the problem of gain reduction and gain jitter of an optical fiber brillouin amplifier caused by the random birefringence effect of the gain optical fiber; meanwhile, the steps that a traditional single-pump optical fiber brillouin amplifier needs to adjust the relative polarization state of signal light and pumping light are omitted, and the signal light at any input polarization state can obtain stable high gain; the second purpose is to distinguish true amplification signals and amplified self-released brillouin flash noise. Therefore, an orthogonal double-pumpinggeneration unit composed of a 50: 50 optical fiber splitter, a first er-doped optical fiber amplifier, a first polarization controller, a second er-doped optical fiber amplifier, a second polarization controller and a 50: 50 optical fiber combiner is added behind the pump laser. An amplification signal screening unit composed of a third polarization controller and a polarization beam splitter isadded at the output end of