Multimode Optical Fiber Beam-By-Beam Cleanup

Year: 2023

Authors: Ferraro M., Mangini F., Leventoux Y., Tonello A., Zitelli M., Mansuryan T., Sun YF., Fevrier S., Krupa K., Kharenko D., Wabnitz S., Couderc V.

Autors Affiliation: Sapienza Univ Rome, Dept Informat Engn Elect & Telecommun DIET, I-00184 Rome, Italy; CNR INO, Ist Nazl Ott, I-80078 Pozzuoli, Italy; Univ Limoges, XLIM Inst, UMR 7252, CNRS, F-87060 Limoges, France; Polish Acad Sci, Inst Phys Chem, PL-02668 Warsaw, Poland; Novosibirsk State Univ, Inst Automat & Electrometry SB RAS, Novosibirsk 630090, Russia.

Abstract: We introduce and experimentally demonstrate the concept of all-optical beam switching in graded-index multimode optical fibers. Nonlinear coupling between orthogonally polarized seed and signal beams permits to control the spatial beam quality at the fiber output. Remarkably, we show that even a few-mode control beam whose power is about ten times lower than that of the total beam may substantially enhance the quality of an intense, highly multimode signal beam. We propose a simple geometrical representation of the beam switching operation, whose validity is quantitatively confirmed by the experimental mode decomposition of the output beam. All-optical switching of multimode beams may find important applications in high-power beam delivery and fiber lasers.

Journal/Review: JOURNAL OF LIGHTWAVE TECHNOLOGY

Volume: 41 (10)      Pages from: 3164  to: 3174

More Information: This work was supported in part by European Research Council (ERC) Research and Innovation Program under Grant 740355, in part by the Italian Ministry of University and Research under Grant R18SPB8227, in part by the Sapienza University of Rome under Grants RG12117A84DA7437, AR2221815ED243A0, and AR2221815C68DEBB, in part by EU HORIZON2020 Marie Sklodowska-Curie Program under Grant 713694, in part by French research national agency under Grants ANR-18-CE080016-01 and ANR-10-LABX-0074-01, and in part by Narodowa Agencja Wymiany Akademickiej, and French-Polish Partnership Hubert Curien, POLO-NIUM under Grants BPN/BFR/2021/1/00013 and 48161TH.
KeyWords: Laser beams; Optical beams; Optical fiber polarization; Optical switches; Ultrafast optics; Fiber nonlinear optics; Optical fiber communication; Multimode fibers; optical switch; optical transistor; spatial beam self-cleaning
DOI: 10.1109/JLT.2023.3239385

Citations: 8
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