Angular momentum, a fundamental physical quantity, can be divided into spin angular
momentum (SAM) and orbital angular momentum (OAM) in electromagnetic waves. Helically …

Optical vortices carrying orbital angular momentum (OAM) have attracted increasing interest
in recent years. Optical vortices have seen a variety of emerging applications in optical …

Orbital angular momentum (OAM) modes, having unique properties of a helical phase
structure and doughnut intensity profile, have been widely studied in fiber-optic …

We report on the design and characterization of ring-assisted (RA) few-mode fibers with
improved minimum mode effective index difference MinΔn eff. By introducing a high-index …

Vortex beams have attracted much attention in recent years due to unique features of the
phase or polarization singularity in the center part of beams. Various applications have been …

The unique modal characteristics of ring core fibers (RCFs) potentially enable the
implementation of mode-division multiplexing (MDM) schemes that can increase optical data …

Orbital angular momentum can be used to implement high capacity data transmission
systems that can be applied for classical and quantum communications. Here we …

This study proposes a distributed large-curvature sensor based on ring-core few-mode fiber
(RC-FMF) and differential pulse-pair Brillouin optical time-domain analysis (DPP-BOTDA) …

We propose a novel scheme of air-trench (AT) assisted graded-index profile to design a
heterogeneous few-mode multi-core fiber (hetero-FM-MCF) with high density of cores and …

The monitoring and conversion of photonic orbital angular momentum (OAM) play
fundamental and important roles for both classic and quantum technologies, especially in …