We report the fabrication of the first hollow-core revolver fibre with a core diameter as small as μ 25 μ m and an optical loss no higher than 75 dB km − 1 at a wavelength of 1850 nm . The decrease in core diameter, with no significant increase in optical loss, is due to the use of double nested capillaries in the reflective cladding design. A number of technical problems pertaining to the fabrication of such fibres are resolved.
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Kosolapov et al. (2016) studied this question.
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