Forward Brillouin scattering in few-mode fibers

Elad Layosh; Elad Zehavi; Alon Bernstein; Mirit Hen; Maayan Holsblat; Ori Pearl; Avi Zadok

doi:10.1038/s41377-025-01877-z

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Forward Brillouin scattering in few-mode fibers

Original Articles

- Forward Brillouin scattering in few-mode fibers
- Forward Brillouin scattering in few-mode fibers
- LSA 2025年14卷第9期页码：2552-2570
- Affiliations：
  
  1.Faculty of Engineering and Institute for Nano-Technology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
  2.Presently with the Faculty of Electrical and Computer Engineering and the Solid State Institute, Technion – Israel Institute of Technology, Haifa 3200003, Israel
- Author bio：
  
  Avi Zadok (Avi.Zadok@technion.ac.il)
- Funds：
- DOI：10.1038/s41377-025-01877-z
  中图分类号：
- 收稿日期：2024-11-22，
  
  修回日期：2025-04-22，
  
  录用日期：2025-04-24，
  
  网络出版日期：2025-07-09，
  
  纸质出版日期：2025-09-30
- Accepted：
Scan QR Code
Forward Brillouin scattering in few-mode fibers[J]. LSA, 2025,14(9):2552-2570.

Layosh, E. et al. Forward Brillouin scattering in few-mode fibers. Light: Science & Applications, 14, 2552-2570 (2025).
Forward Brillouin scattering in few-mode fibers[J]. LSA, 2025,14(9):2552-2570. DOI： 10.1038/s41377-025-01877-z.

Layosh, E. et al. Forward Brillouin scattering in few-mode fibers. Light: Science & Applications, 14, 2552-2570 (2025). DOI： 10.1038/s41377-025-01877-z.

摘要

Abstract

Forward Brillouin scattering is an opto-mechanical effect in which two co-propagating optical fields couple with an acoustic mode in a common medium. The effect has been studied in standard optical fibers since 1985

however nearly all studies have been limited to the single optical mode regime. Forward Brillouin scattering in single-mode fibers takes place through two classes of acoustic modes only: purely radial ones and modes of two-fold azimuthal symmetry. Acoustic modes may only be stimulated at their cut-off frequencies

and the acoustic frequencies in standard fibers are limited to 600 MHz. In this work

we extend the study of forward Brillouin scattering to few-mode optical fibers through analysis

calculations

and experiment. Measurements are performed in a commercial

off-the-shelf step-index fiber with standard cladding through three optical modes. We demonstrate for the first time the stimulation of acoustic modes with first-order and fourth-order azimuthal symmetries. Acoustic frequencies up to 1.8 GHz are observed

and the acoustic modes are stimulated above their cut-off frequencies. Angular momentum is transferred between the orbital degrees of freedom of the optical and acoustic waves. The results extend the understanding and formulation of forward Brillouin scattering in optical fibers

and they may find applications in fiber lasers

sensing

non-reciprocal propagation effects

and quantum states manipulation.

关键词

Keywords

references

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