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

Andrei Fotiadi1,2, Edik Rafailov3, Dmitry Korobko4

  • 1Optoelectronics and Measurement Techniques Unit, University of Oulu, 90570 Oulu, Finland.

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Summary

This study details stimulated Brillouin scattering (SBS) in multimode optical fibers. We present a theoretical model revealing how sound propagation influences SBS gain spectra between different optical modes.

Keywords:
Brillouin imagingdistributed Brillouin sensingmode-division multiplexingmultimode optical fiberoptical fiber amplifiersstimulated Brillouin scattering

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Area of Science:

  • Optics and Photonics
  • Acousto-optics
  • Nonlinear Fiber Optics

Background:

  • Multimode optical fibers can support multiple optical modes.
  • Stimulated Brillouin scattering (SBS) is a nonlinear optical process occurring when light interacts with acoustic waves.
  • Understanding SBS in multimode fibers is crucial for applications like optical sensing and signal processing.

Purpose of the Study:

  • To develop a theoretical framework for analyzing SBS interactions between selectively excited optical modes in multimode fibers.
  • To investigate the influence of acoustic field distribution on SBS gain spectra.
  • To elucidate the role of sound propagation effects in SBS within multimode optical fibers.

Main Methods:

  • Developed a theoretical formalism for SBS in acoustically isotropic multimode optical fibers.
  • Utilized a weakly guiding step-index fiber approximation.
  • Derived an analytical expression for the spatial distribution of the acoustic field amplitude.
  • Analyzed SBS gain spectra for interactions between different order modes.

Main Results:

  • Successfully modeled the SBS interaction between individual optical modes in a multimode fiber.
  • Provided an analytical expression for the acoustic field amplitude distribution.
  • Demonstrated how sound propagation characteristics affect SBS gain spectra.
  • Showcased distinct contributions of acoustic effects to the SBS gain spectrum.

Conclusions:

  • The theoretical model provides clear insights into sound propagation effects accompanying SBS in multimode fibers.
  • Specific contributions of acoustic fields to the SBS gain spectrum are identified.
  • This work advances the understanding of nonlinear light-sound interactions in multimode optical systems.