Spontaneous Brillouin Scattering in a Few-Mode Optical Fiber

• URL: http://arxiv.org/abs/2601.06569v1
• Date: Sat, 10 Jan 2026 13:31:09 GMT
• Title: Spontaneous Brillouin Scattering in a Few-Mode Optical Fiber
• Authors: Hikari Kikuchi, Rekishu Yamazaki,
• Abstract summary: We report a comprehensive experimental study of spontaneous Brillouin scattering in a few-mode optical fiber.<n>Using heterodyne detection, Stokes and anti-Stokes components without external acoustic excitation are observed and quantitatively extracted Brillouin shifts, linewidths, and gain coefficients.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report a comprehensive experimental study of spontaneous Brillouin scattering in a few-mode optical fiber, resolving both forward and backward scattering processes for intra- and inter-modal interactions. Using heterodyne detection, Stokes and anti-Stokes components without external acoustic excitation are observed and quantitatively extracted Brillouin shifts, linewidths, and gain coefficients. Forward scattering is mediated by guided torsional-radial acoustic modes with frequencies ranging from MHz to GHz, while backward scattering involves longitudinal core-guided modes at frequencies of tens of GHz. These results provide calibrated benchmarks for Brillouin interactions in few-mode fibers, offering insights relevant to phonon-based quantum applications and mode-selective optomechanics.

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