[15p-S4_201-1~12] 3.14 Optics and Photonics English Session

5:00 PM - 5:15 PM JST(8:00 AM - 8:15 AM UTC)English Presentation

[15p-S4_201-12] Single- and double-bar nested negative curvature hollow-core optical fibers for low-loss guidance

〇(DC)Zehra Gizem Mutlay^1,2, Mustafa Ordu^1,2 (1.Bilkent Univ., 2.UNAM-National Nanotechnology Research Center)

Keywords:

photonic crystal waveguides,negative curvature hollow core fibers

Negative curvature hollow-core optical fibers (NCFs) achieve ultralow loss by guiding light in an air core via antiresonant solid membranes, surpassing the Rayleigh scattering limit of solid-core fibers. The resulting minimal light–solid overlap enables near-vacuum propagation speed, reduced nonlinearity, and low chromatic dispersion, while supporting high-power transmission. In this study, interstitial tubes were incorporated into simple tubular NCF designs, introducing single-bar (1-BNCF) and double-bar (2-BNCF) support elements. The fibers, composed of polycarbonate and air, were numerically analyzed using a finite-element electromagnetic solver at 1.55 um. The core diameter (R = 40 um) and uniform strut and bar thickness (t = 0.38 um) were fixed for both designs, while bar positions and inter-bar spacing were varied. The double-bar design exhibits a significantly lower confinement loss of 2.27×10^-6 dB/m compared to 6.33×10^-5 dB/m for the single-bar structure, demonstrating the effectiveness of bar configuration optimization.