光纤中基于SBS实现慢光的数值研究

Numerical Study of SBS Slow Light in Optical Fibers

通过运用带有预测-校正的隐格式有限差分法对基于光纤的受激布里渊散射耦合方程组进行了数值求解。在增益0～16范围内考察了布里渊增益系数、增益带宽以及有效模面积对时间延迟和脉冲展宽的影响。结果表明,较小的增益系数和增益带宽、较大的有效模面积使得Stokes信号具有更大的饱和增益值,相应的时间延迟也较大。在固定泵浦功率并保证增益参数在小信号范围的情况下,时间延迟及脉冲展宽因子随着增益系数的增加而增加,但随着增益带宽以及有效模面积的增加而减少。

The fiber-based Stimulated Brillouin Scattering （SBS） coupled equations were solved by the method of implicit finite difference with prediction-correction. The influences of the Brillouin gain coefficient, gain bandwidth and effective mode area on time delay and pulse broadening were investigated within the gain range of 0-16. The results indicate that the Stokes pulse will reach gain saturation at a larger gain for smaller gain coefficient, smaller gain bandwidth and larger effective mode area, and its maximum time ＂delay is accordingly larger. At a given pump power whose gain parameter is in small signal range, the time delay and pulse broadening factor increase with the Brillouin gain coefficient increasing but decrease with the Brillouin gain bandwidth and the effective mode area increasing