University of Oulu

Fotiadi A, Rafailov E, Korobko D, Mégret P, Bykov A, Meglinski I. Brillouin Interaction between Two Optical Modes Selectively Excited in Weakly Guiding Multimode Optical Fibers. Sensors. 2023; 23(3):1715.

Brillouin interaction between two optical modes selectively excited in weakly guiding multimode optical fibers

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Author: Fotiadi, Andrei1,2; Rafailov, Edik3; Korobko, Dmitry4;
Organizations: 1Optoelectronics and Measurement Techniques Unit, University of Oulu, 90570 Oulu, Finland
2Electromagnetism and Telecommunication Department, University of Mons, B-7000 Mons, Belgium
3Optoelectronics and Biomedical Photonics Group, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK
4S.P. Kapitsa Scientific Technological Research Institute, Ulyanovsk State University, 42 Leo Tolstoy Str., 432970 Ulyanovsk, Russia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.8 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2023
Publish Date: 2023-08-11


A multimode optical fiber supports excitation and propagation of a pure single optical mode, i.e., the field pattern that satisfies the boundary conditions and does not change along the fiber. When two counterpropagating pure optical modes are excited, they could interact through the stimulated Brillouin scattering (SBS) process. Here, we present a simple theoretical formalism describing SBS interaction between two individual optical modes selectively excited in an acoustically isotropic multimode optical fiber. Employing a weakly guiding step-index fiber approach, we have built an analytical expression for the spatial distribution of the sound field amplitude in the fiber core and explored the features of SBS gain spectra, describing the interaction between modes of different orders. In this way, we give a clear insight into the sound propagation effects accompanying SBS in multimode optical fibers, and demonstrate their specific contributions to the SBS gain spectrum.

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Series: Sensors
ISSN: 1424-8220
ISSN-E: 1424-8220
ISSN-L: 1424-8220
Volume: 23
Issue: 3
Pages: 1 - 17
DOI: 10.3390/s23031715
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
114 Physical sciences
113 Computer and information sciences
217 Medical engineering
Funding: A.F. is supported by the European Union’s Horizon 2020 research and innovation program (H2020-MSCA-IF-2020, #101028712). E.R. acknowledges the financial support from the Engineering and Physical Sciences Research Council (EPSRC, #EP/R024898/1). D.K. is grateful for the support from the Ministry of Science and Higher Education of the Russian Federation (project #075-15-2021-581) and the Russian Science Foundation (#22-72-10072).
EU Grant Number: (101028712) HiFi Brilliancy - HIgh-speed FIbre-based BRILLouIn ANalyzer for endosCopY
Copyright information: © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (