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Low-loss single-mode modified conjoined tube hollow-core fiber

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Abstract

We explain the effects of cladding geometries on conjoined tube hollow-core negative curvature fibers and offer a modified conjoined tube negative curvature fiber with appropriate positioning of an additional negative curvature D-shaped layer joining the flat bar to reveal attractive performances over existing recent related fibers. The proposed fiber ensures the least loss of 0.003 dB/km at 1.43 µm, a ${\sim}0.04\;{{\rm dB}/{\rm km}}$ loss covering the wide bandwidth of approximately 300 nm, the lowest surface scattering loss of ${\sim}0.02\;{{\rm dB}/{\rm km}}$, and the lowest microbending loss of ${\sim}0.04\;{{\rm dB}/{\rm km}}$, thus providing a propagation loss of 0.10 dB/km at the 1.55 µm wavelength and also offering excellent bend loss performance (${\sim}0.015\;{{\rm dB}/{\rm km}}$ loss at a 7 cm bend radius). The fiber, with a core diameter of 30.50 µm, also shows a higher-order mode extinction ratio of ${\sim}1600$ and maintains greater than 100 over most of the telecom bands; hence, it effectively provides single-mode operation. We show the potential of conjoined tube hollow-core negative curvature fibers in optical communications systems.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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