Genetic Algorithm Based O-band Multi-step-Index OAM Fiber Design

We investigate an orbital angular momentum (OAM) mode supporting fiber scheme for O-band data center MIMO-less transmission scene. How to increase the weakly-coupled mode group (MG) and meanwhile not decrease the mode purity is an issue. Genetic Algorithm (GA) is used to design a six radial first-order OAM modes supporting ring-core fiber, where multi-step-index structure is used to modulate the effective refractive index difference (Δn
eff
) between the radial first-order OAM mode and the adjacent mode to get more useful MGs and high purity OAM modes.