Vortex Field Propagation in a Hexagonal Multicore Fiber Array

Abstract

The propagation of an optical vortex in a hexagonally arranged single mode multicore fiber structure is investigated for possible generation of additional vortices and their spread dynamics. Fields are separated into a slowly varying paraxial envelope and a rapidly changing exponential component. Solutions are derived from the paraxial inhomogeneous Schrodinger equation in two dimensions along with the index of refraction of the proposed structure. Numerical analyses are based on the beam propagation method and transparent boundary conditions in matrix form with different parameters to represent the intensity and phase of all derived fields. Vortices are numerically identified by their points of zero intensity and their phase change or polarity. The optical interferogram with a plane wave reference is also employed to distinguish the dislocation points in the transverse directions of the propagating fields.

Scalable orbital-angular-momentum sorting without destroying photon states

“…Outlook. Although traditional integrated optical circuits [40][41][42][43] are not compatible with OAM light, special optical fibers for OAM light communication have been reported, and the transmission length record is over 1 kilometer with low crosstalk [44][45][46][47]. Furthermore, great progresses has been made on OAM light generation and multiplexing with integrated optical circuit technologies [17,[48][49][50].…”