Cladding effect on confinement and bend losses in hypocycloid-core Kagome HC-PCF

Abstract

International audienceWe report on numerical and experimental results on the influence of cladding ring number in hypocycloid-core Kagome HC-PCF. The number of rings has moderate effect on confinement loss whereas strong reduction in bend loss is demonstrated

Light guiding properties of negative-curvature hollow-core fiber

“…Several recent numerical reports proposed introducing another layer of antiresonant tubes in NC-HCF [66][67][68]. We note that in broadband guiding hollow-core photonic-crystal fibers, such as kagomé fibers, having additional cladding layers cause only a minor impact on the guiding properties [75][76][77]. On the other hand, the effect of doing so in NC-HCFhas not been thoroughly studied yet.…”

“…In Kagome fiber, introducing additional layers has a negligible effect on reducing transmission loss, i.e., having more cladding layers in Kagome fiber does not contribute to coherent reflections. This fact has been proven experimentally and numerically [43,[75][76][77]. Silica struts that are used to connect the silica layer in the radial direction is detrimental to achieving coherent reflection because they create nodes and hence remarkably degrade the guidance performance.…”

“…Nodes will form at the contacting points of different dielectic layers. The role of each cladding layer on light confinement has also been studied [75][76][77]. Many studies have shown that the silica layer surrounding the core plays the most important role, whereas the second silica layer plays a minor role [43,[75][76][77].…”

“…The role of each cladding layer on light confinement has also been studied [75][76][77]. Many studies have shown that the silica layer surrounding the core plays the most important role, whereas the second silica layer plays a minor role [43,[75][76][77]. The silica layer will seriously deform at nodes and the performance will be worsen.…”