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Abstract <p>Within the framework of the geometric optics model, an algorithm is developed for numerical calculation of the oblique ray trajectory in a highly multimode tapered optical fiber with a rectilinear generatrix. The algorithm makes it possible to simulate 3D trajectories of oblique rays in a&#xa0;tapered fiber with larger and smaller core diameters <i>D</i>/<i>d</i> = 400/200 μm/μm, length <i>l</i><sub><i>t</i></sub> = 10 cm, and a nominal numerical aperture <i>NA</i> = 0.42. Aperture properties of such fiber and regimes of ray propagation along the taper are studied; “resonant” types of trajectories are identified. Experiments are performed to excite oblique rays in a taper with core diameters <i>D</i>/<i>d</i> = 2000/400 μm/μm, <i>l</i><sub><i>t</i></sub> = 30 cm, and a nominal numerical aperture <i>NA</i> = 0.22 upon illumination from a larger diameter, qualitatively confirming the results of numerical simulation.</p>

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Simulation of Oblique Ray Trajectories in a Multimode Tapered Optical Fiber

  • 期刊论文

  • 发表日期：

    2025年9月21日

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  • A. A. Makovetskii,
  • S. M. Popov,
  • D. V. Ryakhovskii

摘要

Abstract

Within the framework of the geometric optics model, an algorithm is developed for numerical calculation of the oblique ray trajectory in a highly multimode tapered optical fiber with a rectilinear generatrix. The algorithm makes it possible to simulate 3D trajectories of oblique rays in a tapered fiber with larger and smaller core diameters D/d = 400/200 μm/μm, length lt = 10 cm, and a nominal numerical aperture NA = 0.42. Aperture properties of such fiber and regimes of ray propagation along the taper are studied; “resonant” types of trajectories are identified. Experiments are performed to excite oblique rays in a taper with core diameters D/d = 2000/400 μm/μm, lt = 30 cm, and a nominal numerical aperture NA = 0.22 upon illumination from a larger diameter, qualitatively confirming the results of numerical simulation.