Modal phase-locking in multimode nonlinear optical fibers

Year: 2023

Authors: Mangini F., Ferraro M., Sun YF., Gervaziev M., Parra-Rivas P., Kharenko DS., Couderc V., Wabnitz S.

Autors Affiliation: Sapienza Univ Rome, Dept Informat Engn Elect & Telecommun, Via Eudossiana 18, I-00184 Rome, Italy; Novosibirsk State Univ, Pirogova 1, Novosibirsk 630090, Russia; SB RAS, Inst Automation & Electrometry, Novosibirsk 630090, Russia; Univ Limoges, XLIM, UMR CNRS 7252, 123 Ave A Thomas, F-87060 Limoges, France; Ist Nazl Ottica, CNR INO, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy.

Abstract: Spatial beam self-cleaning, a manifestation of the Kerr effect in graded-index multimode fibers, involves a nonlinear transfer of power among modes, which leads to robust bell-shaped output beams. The resulting mode power distribution can be described by statistical mechanics arguments. Although the spatial coherence of the output beam was experimentally demonstrated, there is no direct study of modal phase evolutions. Based on a holographic mode decomposition method, we reveal that nonlinear spatial phase-locking occurs between the fundamental and its neighboring low-order modes, in agreement with theoretical predictions. As such, our results dispel the current belief that the spatial beam self-cleaning effect is the mere result of a wave thermalization process. (c) 2023 Optica Publishing Group

Journal/Review: OPTICS LETTERS

Volume: 48 (14)      Pages from: 3677  to: 3680

More Information: H2020 European Research Council (740355) ; Ministero dell’Istruzione, dell’Universita e della Ricerca (R18SPB8227) ; Sapienza Universita di Roma (AR2221815ED243A0, RG12117A84DA7437) ; H2020 Marie Sklodowska-Curie Actions (101023717, 101064614, 713694) ; Agence Nationale de la Recherche (ANR-10-LABX-0074-01, ANR-18-CE080016-01) ; RSF (21-42-00019) .
KeyWords: Polarization Instabilities
DOI: 10.1364/OL.494543

Citations: 3
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