Break up of the azimuthal symmetry of higher order fiber modes

Stine Møller Israelsen, Lars Søgaard Rishøj, Karsten Rottwitt

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We investigate Bessel-like modes guided in a double cladding fiber where the outer cladding is an aircladding. For very high order LP0 X-modes, the azimuthal symmetry is broken and the mode is no longer linearly polarized. This is observed experimentally and confirmed numerically. The effect is investigated numerically using a full vectorial modesolver and is observed to be dependent on the fiber design. The effect on the diffraction free propagation distance of the modes is investigated using a fast Fourier transform propagation routine and compared to the properties of an ideal circularly symmetric mode. The free space properties of modes suffering from break up of azimuthal symmetry are also investigated experimentally by measuring the free space propagation of a LP016-mode excited in the double cladding fiber. © 2014 Optical Society of America.
Original languageEnglish
JournalOptics Express
Issue number10
Pages (from-to)11861-11868
Publication statusPublished - 2014


  • Cladding (coating)
  • Fast Fourier transforms
  • Azimuthal symmetries
  • Double cladding fiber
  • Fiber design
  • Free propagation
  • Free space propagation
  • Free spaces
  • Linearly polarized
  • Symmetric mode
  • Fibers

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