A Novel Inverse Gaussian Profile for Orbital Angular Momentum Mode Division Multiplexing Optical Networks

Orbital angular momentum modes have shown promising achievements, as data carriers, in ameliorating the transmission capacity and raising the spectral efficiency. This has leaded to an increasing interest in exploiting appropriate specialty fibers for supporting robust OAM channels. In this work, we propose a novel inner graded ring core fiber referred to as inverse Gaussian fiber (IGF). To the best of our knowledge, IGF has never been used as optical fiber profile before. We optimize IGF key parameters in order to design optimized IG-few mode fibers (FMF) supporting low radial modes with high intermodal separation that outperforms those reported in literature (minimum of $\Delta n_{\text{eff}}=2.74\times 10^{-4}$), this limits mode coupling and reduces channels crosstalk. We investigate the impacts of smoothness parameters ($\alpha$ & $P$) on the properties of OAM channels in the IG-FMFs. We evaluate and compare (with literature) their intermodal separation, their chromatic dispersion, and their associated differential group delay over the C+L ITU-T bands. The selected designs are proposed as favorable candidate to guide OAM modes in next generation OAM-MDM multiplexing optical networks.