Zhu Zimu, Wright Logan G, Christodoulides Demetrios N, Wise Frank W
Opt Lett. 2016 Oct 15;41(20):4819-4822. doi: 10.1364/OL.41.004819.
We experimentally isolate and directly observe multimode solitons in few-mode graded-index fiber. We rely on Raman frequency shifts to spectrally isolate these multimode solitons. By varying the input energy and modal composition of the launched pulse, we observe a continuous variation of multimode solitons with different spatiotemporal properties. They exhibit an energy-volume relation that is distinct from those of single-mode and fully spatiotemporal solitons.