Design and optimization of photonic crystal fiber with low confinement loss guiding 98 OAM modes in THz band

Abstract A newer and efficient solid core with air holes and ring based circular photonic crystal fiber (C-PCF) design is proposed and studied. The SF2 doped ring core C-PCF structure with three layers of air holes is developed to communicate terahertz band in the range of 1–3 THz with >10−4 mode index separation. The finite element method (FEM) is used to optimize the position, shape and dimensions of air holes for the proposed PCF architecture and evaluate the efficiency to support different orbital angular momentum (OAM) modes for communication. Our novel fiber supports 98 stable OAM modes with mode purity above 0.86 for all modes. Low Confinement loss ( ∼ 0.1 mm2) and low dispersion (