Shmilovitch Zohar, Primerov Nikolay, Zadok Avi, Eyal Avishay, Chin Sanghoon, Thevenaz Luc, Tur Moshe
School of Electrical Engineering, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, Israel.
Opt Express. 2011 Dec 19;19(27):25873-80. doi: 10.1364/OE.19.025873.
Stimulated Brillouin scattering (SBS) amplification of probe signals is highly polarization dependent. Maximum and minimum gain values are associated with a pair of orthogonal states of polarization (SOP), which are related to the pump SOP. Since the maximum gain is much higher than the minimum, the SOP of the output probe is pulled towards that of the maximum amplification. Polarization pulling is restricted, however, by pump depletion. In this work, a new method is proposed, analyzed and demonstrated for enhanced SBS polarization pulling, using two orthogonal pumps. Here, one pump amplifies one polarization component of the probe wave, and at the same time the other pump attenuates the corresponding orthogonal component, resulting in a push-pull effect. In the undepleted regime and for equal total power, the same degree of pulling is achieved as in the single pump case, but at a significantly less signal gain. Thus, the dual pump technique can provide high pulling efficiency for stronger input signals, deferring the onset of depletion.
受激布里渊散射（SBS）对探测信号的放大高度依赖于偏振。最大和最小增益值与一对正交偏振态（SOP）相关，这对正交偏振态与泵浦SOP有关。由于最大增益远高于最小增益，输出探测信号的SOP会被拉向最大放大的SOP。然而，偏振拉拽受到泵浦耗尽的限制。在这项工作中，提出、分析并演示了一种使用两个正交泵浦来增强SBS偏振拉拽的新方法。在此，一个泵浦放大探测波的一个偏振分量，同时另一个泵浦衰减相应的正交分量，从而产生推挽效应。在未耗尽状态且总功率相等的情况下，与单泵浦情况相比可实现相同程度的拉拽，但信号增益显著降低。因此，双泵浦技术可为更强的输入信号提供高拉拽效率，推迟耗尽的开始。
