Abstract
Confinement loss of inhibited coupling fibers with a cladding composed of a lattice of tubes of various shapes is theoretically and numerically investigated. Both solid core and hollow core are taken into account. It is shown that in case of polygonal shaped tubes, confinement loss is affected by extra loss due to Fano resonances between core modes and cladding modes with high spatial dependence. This explains why hollow core Kagome fibers exhibit much higher confinement loss with respect to tube lattice fibers and why hypocycloid core cladding interfaces significantly reduce fiber loss. Moreover it is shown that tube deformations, due for example to fabrication process, affect fiber performances. A relationship between the number of polygon sides and the spectral position of the extra loss is found. This suggests general guide lines for the design and fabrication of fibers free of Fano resonance in the spectral range of interest.
Highlights
Inhibited Coupling Fibers (ICFs) have been extensively studied in recent years [1,2,3,4,5,6,7,8,9]
Confinement loss of inhibited coupling fibers with a cladding composed of a lattice of tubes of various shapes has been theoretically and numerically investigated
It has been shown that in case of polygonal shaped tubes, confinement loss is affected by extra losses with respect to fibers with circular tubes
Summary
Inhibited Coupling Fibers (ICFs) have been extensively studied in recent years [1,2,3,4,5,6,7,8,9]. It has been numerically shown that in HC-TLFs with polygonal tubes (Polygonal TLFs - PTLFs), loss reduces by increasing the number of sides of the polygons, and that CTLFs exhibit the best performance [10]. In this paper it will be shown that a similar coupling mechanism appears in TLFs when the tubes composing the cladding are changed from a circular shape (CTLFs) to a polygonal one (PTLFs). Circular shaped cladding tubes represent the best case for the confinement loss spectrum, while KFs composed of hexagonal tubes are affected by extra loss over the whole spectrum. This is very important both from a design and manufacturing point of view.
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