Scientific Results

Nonlinear dynamics in multimode optical fibers

Year: 2018

Authors: Wabnitz S., Tonello A., Couderc V., Modotto D., Barthélémy A., Millot G., Krupa K.

Autors Affiliation: Dipartimento di Ingegneria dell

Abstract: We overview recent advances in the research on spatiotemporal beam shaping in nonlinear multimode optical fibers. An intense light beam coupled to a graded index (GRIN) highly multimode fiber undergoes a series of complex nonlinear processes when its power grows larger. Among them, the lowest threshold effect is the Kerr-induced beam self-cleaning, that redistributes most of the beam energy into a robust bell-shaped beam close to the fundamental mode. At higher powers a series of spectral sidebands is generated, thanks to the phase matching induced by the long period grating due to the periodic self-imaging of the beam and the Kerr effect. Subsequently a broadband and spectrally flat supercontinuum is generated, extending from the visible to the mid-infrared.

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More Information: We acknowledge the financial support of: Horiba Medical and BPI france within the Dat@diag project; iX-core research foundation; French National Research Agency ANR Labex ACTION; the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 740355); the European Union’s Horizon 2020 research and innovation programme under the Marie Sk lodowska-Curie grant agreement No. 2015-713694 (”BECLEAN” project). – The Society of Photo-Optical Instrumentation Engineers (SPIE)
KeyWords: Nanoelectronics; Nonlinear optics; Optical communication; Optical fibers; Phase matching, Beam reshaping; Fundamental modes; Long Period Gratings; Multimode optical fibers; Nonlinear process; Parametric effects; Spectral sidebands; Threshold effect; Multimode fiber

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