Measurement of resonant bend loss in anti-resonant hollow core optical fiber

Richard Carter, Fei Yu, William J. Wadsworth, Jonathan D. Shephard, Timothy A. Birks, Jonathan C. Knight, Duncan Paul Hand

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41 Citations (Scopus)
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We present the results of measurements of resonant spectral bend loss using a novel apparatus in a series of hollow core anti-resonant optical fibers, important for their applications in the delivery of industrial power ultra-short laser pulses. The measured bend losses exhibit clear wavelength-bend diameter resonances. We demonstrate, in good agreement with theoretical analysis, that the sensitivity to bend diameter (in terms of minimum bend radii) is dependent on the ratio between cladding and core structure size. By decreasing the cladding capillary diameter : core diameter ratio from 0.70 to 0.43 the minimum bend diameter is decreased from >160 mm to ~ 15 mm at a wavelength of 800 nm. Furthermore it is demonstrated that the exact position of the loss bands is highly dependent on the orientation of the fiber structure with the bend plane.
Original languageEnglish
Pages (from-to)20612-20621
Number of pages10
JournalOptics Express
Issue number17
Early online date15 Aug 2017
Publication statusPublished - 21 Aug 2017


  • fiber characterisation
  • Fiber optics
  • fiber properties
  • Microstructured fibers
  • fiber design and characterisation


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