1. Ultralow transmission loss in inhibited-coupling guiding hollow fibers
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A. Amsanpally, Fetah Benabid, J.-M. Blondy, Luca Vincetti, Martin Maurel, Assaad Baz, Florent Scol, Frédéric Gérôme, Emmanuel Hugonnot, Matthieu Chafer, and Benoit Debord
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All-silica fiber ,Materials science ,business.industry ,Plastic-clad silica fiber ,Transmission loss ,02 engineering and technology ,Microstructured optical fiber ,Fiber design and fabrication ,Photonic crystal fibers ,Fiber characterization ,021001 nanoscience & nanotechnology ,Cladding (fiber optics) ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,0103 physical sciences ,Optoelectronics ,0210 nano-technology ,business ,Plastic optical fiber ,Hard-clad silica optical fiber ,Photonic-crystal fiber - Abstract
Attenuation in photonic bandgap guiding hollow-core photonic crystal fiber (HC-PCF) has not beaten the fundamental silica Rayleigh scattering limit (SRSL) of conventional step-index fibers due to strong core-cladding optical overlap, surface roughness at the silica cladding struts, and the presence of interface modes. Hope has been revived recently by the introduction of hypocycloid core contour (i.e., negative curvature) in inhibited-coupling guiding HC-PCF. We report on several fibers with a hypocycloid core contour and a cladding structure made of a single ring from a tubular amorphous lattice, including one with a record transmission loss of 7.7 dB/km at ∼750 nm (only a factor ∼2 above the SRSL) and a second with an ultrabroad fundamental band with loss in the range of 10–20 dB/km, spanning from 600 to 1200 nm. The reduction in confinement loss makes these fibers serious contenders for light transmission below the SRSL in the UV–VIS–NIR spectral range and could find application in high-energy pulse laser beam delivery or gas-based coherent and nonlinear optics.
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