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Using the characteristic that a time delay between the signal of stimulated Brillouin scattering (SBS) and the pump beam during amplification of SBS signal is allowed, a controller is devised to control the polarizations of two pulses propagating collinearly with orthogonal polarizations. It makes the two beams have the same polarization when the SBS signal meets the pump beam. Therefore, amplification of the SBS signal is realized.
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