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Related Experiment Video

Updated: Jun 22, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Free-Form Optical Fiber with a Square Mode and Top-Hat Intensity Distribution.

Rafal Kasztelanic1,2, Hue Thi Nguyen2, Dariusz Pysz2

  • 1Faculty of Physics, University of Warsaw, Pasteur 5, Warsaw, 02-093, Poland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 28, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel nanostructured optical fiber with a square core for single-mode light guidance. This fiber maintains high mode purity even when bent, demonstrating its potential for advanced photonic applications.

Keywords:
effective medium theoryfree‐form fibersnanostructured fibersoptical fibers

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Single-mode optical fibers are crucial for various photonic applications, but achieving bend-insensitivity and specific intensity profiles remains challenging.
  • Traditional fiber fabrication methods often struggle to create complex core structures required for advanced mode control.

Purpose of the Study:

  • To develop a bend-induced effectively single-mode fiber with a square cross-section and flat top-hat intensity distribution.
  • To utilize core topology nanostructuring via femtosecond laser ablation for precise fiber fabrication.
  • To demonstrate the feasibility of nanostructured fibers for controlled light propagation.

Main Methods:

  • Fabrication of a silica nanostructured fiber using femtosecond laser ablation.
  • Core design involving 5419 silica and germanium-doped silica nanorods (430 nm diameter) in a hexagonal lattice.
  • Utilizing in-house developed Monte Carlo algorithm for optimizing rod distribution to achieve target mode and intensity profiles.
  • Experimental verification of mode purity, bending performance, and guiding losses at 1030 nm wavelength.

Main Results:

  • Successfully developed a silica nanostructured fiber with a 24 µm core.
  • Demonstrated effectively single-mode operation with 96% mode purity under bending (20 cm radius) at 1030 nm.
  • Measured a mode area of 360 µm², numerical aperture of 0.03, and low total losses of 0.07 dB m⁻¹.

Conclusions:

  • The developed nanostructured fiber enables bend-induced single-mode operation with a desirable flat top-hat intensity profile.
  • Femtosecond laser ablation and core topology nanostructuring are effective techniques for fabricating advanced optical fibers.
  • The fiber exhibits excellent performance in terms of mode purity and low loss, making it suitable for demanding photonic applications.