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为了避免在高功率光纤放大器和光纤相位共轭镜等实际应用中因受激Brillouin散射(SBS)造成的光纤损伤,根据描述SBS动态弛豫振荡特性的振幅耦合方程,利用有限差分的数值模拟方法研究了光纤中SBS的动态弛豫振荡特性,并对其抑制进行了初步探讨.得到了光纤中SBS弛豫振荡在不同的脉冲上升时间的时空三维图;同时利用方波和脉冲光作抽运光进行了相应实验研究,实验结果与理论模拟结果符合很好.结果表明,增大抽运光脉冲上升时间可以有效抑制因SBS而产生的弛豫振荡,进而避免因其造成的光纤损伤.
In order to avoid optical fiber damage caused by stimulated Brillouin scattering (SBS) in practical applications such as high power fiber amplifier and fiber phase conjugate mirror, according to the amplitude coupling equation describing the dynamic relaxation oscillation of SBS, the finite difference numerical simulation method The dynamic relaxation oscillation of SBS in optical fiber was studied and its suppression was discussed. The space-time three-dimensional image of SBS relaxation oscillation in different optical pulse rise time was obtained. Meanwhile, square wave and pulsed light were used for pumping Light.The experimental results are in good agreement with the theoretical simulation results.The results show that increasing the pumping pulse rise time can effectively restrain the relaxation oscillation caused by SBS and avoid the optical fiber damage caused by it.