基于对光纤中抽运光束和斯托克斯光束的偏振态控制，提出了一种提高受激布里渊散射（SBS）慢光稳定性的实验方案。通过在保偏光纤两端分别熔接保偏光环行器（快轴阻塞）组成一个慢光单元，确保了光纤中抽运光束和斯托克斯光束具有一致的偏振态（沿保偏光纤慢轴）。建立了基于此慢光单元的SBS慢光实验研究系统，对脉宽为38 ns的高斯脉冲获得了0.87 ns/dB的时间延迟；相对于不加偏振控管的单模石英光纤而言，该慢光单元系统的布里渊增益因子提高了3倍。研究表明：该方案能有效地提高SBS效应和SBS慢光时延的稳定性。

Based on controlling the polarizations of the pump and Stokes beams in an optical fiber, a simple scheme for enhancing the stability of stimulated-Brillouin-scattering (SBS) slow light is proposed. By fusing a polarization-maintaining circulator (its fast axis is blocked) to each terminal of a polarization-maintaining fiber (PMF), we construct a slow-light element which ensures the two beams always having identical polarizations (along the slow axis of the PMF). Meanwhile, an experimental setup is established to study the slow-light performance. A tunable time delay of 0.87 ns/dB is demonstrated for a Gaussian pulse with a pulse width of 38 ns. The gain factor of the Brillouin gain in this element enhances three times as compared with that in the single-mode fiber. The experiment indicates that such a polarization-managed scheme significantly improves the stability of SBS interaction and thus that of the slow-light time delay.