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Related Experiment Videos

High numerical aperture in multimode microstructured optical fibers.

Nader A Issa1

  • 1Optical Fibre Technology Centre, Australian Photonics Cooperative Centre, University of Sydney, Australian Technology Park, Eveleigh, New South Wales 1430, Australia. n.issa@oftc.usyd.edu.au

Applied Optics
|December 21, 2004
PubMed
Summary

Microstructured fibers with air holes offer wider light acceptance. Researchers developed a new method using leaky modes to accurately determine their numerical aperture, crucial for high-performance optical applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Microstructured fibers, also known as air-clad fibers, feature air holes around a large core.
  • These fibers exhibit significantly wider light-acceptance angles compared to conventional optical fibers.

Purpose of the Study:

  • To present an original and accurate method for determining the numerical aperture (NA) of microstructured fibers.
  • To evaluate the dependence of NA on fiber length, wavelength, and microstructure dimensions for the first time.

Main Methods:

  • Utilizing leaky modes as an original and accurate approach for NA determination.
  • Systematic evaluation of fiber parameters influencing NA.

Main Results:

  • The study successfully determined the numerical aperture of microstructured fibers using leaky modes.

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  • Demonstrated the dependence of NA on length, wavelength, and microstructure dimensions.
  • Verified that very small bridge thicknesses, less than the wavelength, are essential for achieving high numerical apertures.

    • Conclusions:

    • The developed method provides accurate NA determination for microstructured fibers.
    • The findings confirm the critical role of microstructure dimensions, particularly bridge thickness, in achieving high NA.
    • Results align well with existing experimental data for similar fiber types.