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

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...

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Bibliographic Details
Published in:Optics express 2017-08, Vol.25 (17), p.20612-20621
Main Authors: Carter, Richard M, Yu, Fei, Wadsworth, William J, Shephard, Jonathan D, Birks, Tim, Knight, Jonathan C, Hand, Duncan P
Format: Article
Language:English
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.020612