The Airy fibre: an optical fibre that guides light diffracted by a   circular aperture
  We have designed and made an optical fibre that guides an approximate Airy pattern as one of its guided modes. The fibre's attenuation was 11.0 dB/km at 1550 nm wavelength, the match between the fibre's mode and the ideal infinite Airy pattern was 93.7%, and the far field resembled a top-hat beam. The guidance mechanism has strong similarities to photonic bandgap guidance. 
I. Gris-S\'anchez, D. Van Ras, T. A. Birks
physics.optics