Abstract
We first use numerical simulations to show that bending losses of hollow antiresonant fibers are a strong function of their geometrical structure. We then demonstrate this by fabricating a hollow antiresonant fiber which presents a bending loss as low as 0.25 dB/turn at a wavelength of 3.35 μm and a bend radius of 2.5 cm. This fiber has a relatively low attenuation (<200 dB/km) over 600 nm mid-infrared spectral range.
Highlights
Applied research on hollow core optical fibers [1] includes various applications such as gas, liquid and chemical sensing [2, 3], optical data transmission [4], terahertz propagation [5], power beam delivery for industrial or medical applications [6, 7], and others
We first use numerical simulations to show that bending losses of hollow antiresonant fibers are a strong function of their geometrical structure
We demonstrate this by fabricating a hollow antiresonant fiber which presents a bending loss as low as 0.25dB/turn at a wavelength of 3.35μm and a bend radius of 2.5cm
Summary
Applied research on hollow core optical fibers [1] includes various applications such as gas, liquid and chemical sensing [2, 3], optical data transmission [4], terahertz propagation [5], power beam delivery for industrial or medical applications [6, 7], and others. The adoption of a hollow core can allow more than 99.99% of the travelling light to be concentrated in air rather than in glass This characteristic allows the use of these optical fibers in the midinfrared wavelength regime [8,9,10] where silica absorption becomes high. The first is hollow antiresonant fibers (ARFs) of the type of [8], which have been demonstrated with a loss as low as 34dB/km at 3.05μm and attenuation less than 200dB/km over a mid-infrared transmission bandwidth of about 900 nm [9]. The design investigated here is based on cladding tubes which are not in contact with one another [17], so that each tube is “free” of its neighbours This structure has already been investigated [17] as a possible way to reduce the overall fiber attenuation.
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