非线性光纤环镜在受激布里渊散射慢光级联系统中的可行性研究

基于非线性光纤环镜(NOLM)的脉冲压缩特性,分析了NOLM在基于受激布里渊散射(SBS)慢光级联系统中对延迟脉冲的影响.利用环形结构来模拟多次级联,有效地降低了系统的复杂度,得到了在不同抽运光功率和级联次数下脉冲的延迟输出特性.理论分析表明,NOLM可以有效地抑制SBS慢光级联系统中延迟脉冲的展宽,抽运光功率决定了展宽因子的变化趋势及最终稳定值的大小,展宽因子在级联4次时趋于稳定值,恰当选取抽运光功率可实现脉冲的零展宽延迟;改变抽运光功率和级联次数可以实现延迟量的连续可调,且延迟量理论上不受限制;增大抽 关键词： 慢光 脉冲压缩 非线性光纤环镜 受激布里渊散射

Feasibility study of nonlinear optical loop mirror in the cascaded stimwlated Brillouin scatteving-based slow light system

Based on the pulse compression characteristics in the nonlinear optical loop mirror (NOLM), the effect of NOLM on a cascad stimulated Brillouin scattering based slow light system is analyzed. In this paper, a ring structure is adopted to simulate the cascad system, so the complexity of system is reduced effectively, and the delay characteristics for various numbers of cycles and pump powers are studied. Analysis shows that the NOLM can effectively suppress the pulse-broadening in the cascaded slow light system, pump power determines the tendency and the final steady-state value of the broadening factor, and the broadening factor trends to the steady-state value after 4 cycles. Furthermore, zero-broadening can be obtained by optimizing the pump power; the delay time is continuously adjustable and without any limit in theory through changing the pump power and the number of cycles; through augmenting the pump power, the multiple-cascad-induced chirp can be reduced.