Opt Lett. 2013 Nov 15;38(22):4841-4. doi: 10.1364/OL.38.004841.
Characterization of stimulated Brillouin scattering (SBS) in a few-mode fiber (FMF) is experimentally demonstrated, where the Brillouin gain spectrum (BGS) of intramodal or intermodal SBS is analyzed for different pump-probe pairs of four LP modes--LP(01), LP(11), LP(21), and LP(02) modes--guided in the fiber. A mode-division multiplexer composed of concatenated mode-selective couplers is applied for selective launching of each LP mode, and a differential measurement scheme is adopted for the analysis of the BGS. The intermodal SBS is observed in each pump-probe pair of different modes, and the Brillouin gain is measured to be within 14%-45% of that of the SBS between the LP(01) modes. The SBS threshold of each LP mode in the FMF is also evaluated.
实验演示了在少模光纤（FMF）中受激布里渊散射（SBS）的特性，分析了光纤中导模的不同泵浦-探测对（LP(01)、LP(11)、LP(21)和 LP(02)模式）的模式内或模式间 SBS 的布里渊增益谱（BGS）。采用由级联模式选择耦合器组成的模式分复用器来选择性地激励每个 LP 模式，并采用差分测量方案来分析 BGS。在不同模式的每个泵浦-探测对中观察到了模式间 SBS，测量得到的布里渊增益在 LP(01)模式之间 SBS 的 14%-45%之间。还评估了 FMF 中每个 LP 模式的 SBS 阈值。
