Nonlinear polarization dynamics of Kerr beam self-cleaning in a graded-index multimode optical fiber

Wave condensation with weak disorder versus beam self-cleaning in multimode fibers

“…This effect is characterized by a rotation of the Stokes vector in the (s this nonlinear polarization rotation of the self-cleaned optical beam has been observed experimentally in Ref. [54].…”

“…In this case the simulations reveal the existence of a mixed coherent-incoherent regime, which is still characterized by a relatively fast process of self-cleaning condensation that is consistent with the experiments. (iv) By studying polarization effects [54], we show that optical beam cleaning is responsible for an effective repolarization of the central part of the optical beam, a feature that can be explained by the macroscopic condensed population of the fundamental mode of the MMF. (v) The discrete wave turbulence approach also explains why optical beam self-cleaning has not been observed in step-index MMFs.…”

“…Accordingly, a quantitative comparison between the experimental results of Ref. [54] and our numerical results is not possible without including temporal effects in our model, and specifically the temporal profile of the injected optical pulse. We followed the experimental procedure of Ref.…”

“…To interpret their results, the authors of [54] invoke the key impact of the temporal profile of the optical pulse injected in the MMF. Indeed, the frequency rotation of the Stokes vector depends on the instantaneous value of the power, so that different power levels of the injected pulse profile exhibit different rotation speeds of the Stokes vector.…”

“…We followed the experimental procedure of Ref. [54] by analyzing the polarization properties in the transverse spatial distribution of the optical beam. The effective degree of polarization P(x, y = 0) reported in Fig.…”