增益的提升上限取决于系统受激布里渊散射的阈值，在双程泵浦下增益的上限可得到提高。
The upper limit of the gain is determined by the threshold of the SBS of the system. The maximum gain can be raised in the case of double-pass pumping.
泵浦系统是小型高效率开关型反激式脉冲泵浦源。
The pumping source is a switch type and inverse excitation model in small size but it has high efficiency.
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