Finite element numerical investigation of multimode ultrasonic interference and beatlengths in high frequency fiber-optic devices: 3D design, modeling, and analysis


A novel numerical study based on the finite element method is developed to demonstrate the beatlengths induced by high frequency acoustic modes inside an optical fiber for the first time. A practical methodology to model, compute and analyze the multimode interaction in the fiber is exemplified with a detailed numerical experiment. The frequency response of 1 mm long standard fiber is evaluated from 30 to 60 MHz, corresponding to the highest attenuation band of experimental fiber optoacoustic devices. The 3D simulated complex ultrasonic fields are decomposed and characterized with the averaged peak-to-peak method and 2D Fourier transform. The resulting dispersion spectra are compared and theoretically validated by the recognized Pochhammer-Chree solutions. The acoustic parameters required to modulate optical fibers are derived from the simulations and discussed. A route to overcome the frequency-induced limitations of the current devices is provided, pointing out new research possibilities for the development of highly efficient and compact all-fiber acousto-optic modulators and fiber-optic ultrasonic sensors.

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Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: Copyright © 2022, The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funding: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 713694. The authors acknowledge the use of Athena at HPC Midlands+, which was funded by the EPSRC on grant EP /P020232/1 as part of the HPC Midlands+ consortium.
Uncontrolled Keywords: Spatial-spectral ultrasound analysis,Complex multimode decomposition,Beatlength numerical characterization,3D design optimisation,High frequency acousto-optic modulators,Fiber-optic ultrasonic sensors
Publication ISSN: 0168-874X
Last Modified: 18 Jul 2024 07:18
Date Deposited: 15 Dec 2022 18:18
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Related URLs: https://linking ... 168874X22001597 (Publisher URL)
PURE Output Type: Article
Published Date: 2023-03-01
Published Online Date: 2022-11-25
Accepted Date: 2022-11-16
Authors: da Silva, Ricardo E. (ORCID Profile 0000-0002-6271-0361)
Webb, David J. (ORCID Profile 0000-0002-5495-1296)



Version: Published Version

License: Creative Commons Attribution

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