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.
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.
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