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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38ns的高斯脉冲获得了0.87ns/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 the control of the polarization state of the pump beam and the Stokes beam in the fiber, an experimental scheme for improving the slow light stability of stimulated Brillouin scattering (SBS) is proposed. A slow light unit is formed by splitting the polarization maintaining circulator (fast axis blocking) at both ends of the polarization maintaining fiber to ensure that the pumping light and the Stokes beam in the fiber have a consistent polarization state (along the slow axis of the polarization maintaining fiber) . A SBS slow-light experimental system based on this slow-light unit is established, and a time delay of 0.87ns / dB is obtained for a Gaussian pulse with a pulse width of 38ns. Compared with the single-mode quartz fiber without polarization control, this slow The Brillouin gain factor of the optical unit system is tripled. The research shows that this scheme can effectively improve the stability of SBS effect and slow light delay of SBS.