Brillouin Interaction between Two Optical Modes Selectively Excited in Weakly Guiding Multimode Optical Fibers

Abstract

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.

Publication DOI: https://doi.org/10.3390/s23031715
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design
College of Engineering & Physical Sciences > Engineering for Health
Additional Information: Copyright © 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 (https://creativecommons.org/licenses/by/4.0/). Funding Information: 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). Publisher Copyright: © 2023 by the authors.
Uncontrolled Keywords: Brillouin imaging,distributed Brillouin sensing,mode-division multiplexing,multimode optical fiber,optical fiber amplifiers,stimulated Brillouin scattering,Analytical Chemistry,Information Systems,Biochemistry,Atomic and Molecular Physics, and Optics,Instrumentation,Electrical and Electronic Engineering
Publication ISSN: 1424-8220
Last Modified: 20 Jun 2024 07:22
Date Deposited: 15 Feb 2023 08:48
Full Text Link:
Related URLs: https://www.mdp ... -8220/23/3/1715 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2023-02-03
Accepted Date: 2023-01-31
Authors: Fotiadi, Andrei
Rafailov, Edik (ORCID Profile 0000-0002-4152-0120)
Korobko, Dmitry
Mégret, Patrice
Bykov, Alexander
Meglinski, Igor (ORCID Profile 0000-0002-7613-8191)

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