Open AccessApproximate model for analyzing band structures of single-ring hollow-core anti-resonant fibers
Author(s) -
Ron Fatobene Ando,
Alexander Hartung,
Bumjoon Jang,
Markus Schmidt
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.010009
Subject(s) - multi mode optical fiber , optics , core (optical fiber) , modal , refractive index , lattice (music) , modal dispersion , square lattice , mode (computer interface) , materials science , physics , dispersion (optics) , optical fiber , computational physics , graded index fiber , acoustics , statistical physics , fiber optic sensor , computer science , polymer chemistry , ising model , operating system
Precise knowledge of modal behavior is of essential importance for understanding light guidance, particularly in hollow-core fibers. Here we present a semi-analytical model that allows determination of bands formed in revolver-type anti-resonant hollow-core fibers. The approach is independent of the actual arrangement of the anti-resonant elements, does not enforce artificial lattice arrangements and allows determination of the effective indices of modes of preselected order. The simulations show two classes of modes: (i) low-order modes exhibiting effective indices with moderate slopes and (ii) a high number of high-order modes with very strong effective index dispersion, forming a quasi-continuum of modes. It is shown that the mode density scales with the square of the normalized frequency, being to some extent similar to the behavior of multimode fibers.