论文标题
在分级多模纤维中，联运调制不稳定性与KERR光束自我清洁之间的竞争
Competition Between Intermodal Modulation Instability and Kerr Beam Self-cleaning in Graded-index Multimode Fiber
论文作者
论文摘要
我们报告了由于在各种特定的发射条件下，在90m长的级数多模光纤中，Kerr引起的自束清洁的抑制抑制了模式调节不稳定性峰。已经记录了几种泵脉冲能量值的三种模式（LP01，LP11和LP21）的输出光谱和模束轮廓。实验发现表明，随着泵的峰值的增加，引导模式之间的非线性耦合导致将输出斑点模式重塑为钟形或高阶在空间干净的光束曲线中，而在光谱层间层间调制的不稳定性中，观察到振幅逐渐增加了峰值的峰值和一定的阈值稳定性。这表明有可能在高泵峰功率下产生联运调制不稳定性的无宽带光谱。
We report the suppression of intermodal modulation instability peaks as a consequence of Kerr induced self beam-cleaning in a 90m long graded-index multimode optical fiber under various specific launching conditions. The output spectrum and the modal beam profiles for three modes (LP01, LP11, and LP21) have been recorded for several values of pump pulse energy. Experimental findings establish that the nonlinear coupling among the guided modes leads to reshaping the output speckle pattern into a bell shape or higher-order spatially clean beam profile as the pump peak power increases, whereas in spectral-domain intermodal modulation instability peaks are observed whose amplitude increases gradually to its maximum value and beyond certain threshold power, the intermodal modulation instability peaks diminish. This suggests the possibility to generate intermodal modulation instability free broadband spectra at high pump peak powers.
