Direct observation of the spin-orbit coupling interaction in ring-core optical fibers

TL;DR

This paper demonstrates high-temporal-resolution imaging of spin-orbit coupled modes in ring-core optical fibers using a single-pixel camera, enabling detailed analysis of orbital angular momentum modes at 1550 nm.

Contribution

It introduces a novel imaging technique with enhanced temporal resolution for observing spin-orbit interactions in ring-core fibers.

Findings

Successful imaging of modes separated by 30 ps

High temporal resolution achieved with single-pixel camera

Effective deconvolution improves mode clarity

Abstract

Ring-core optical fibers have been designed to carry orbital angular momentum modes. We demonstrate the imaging of these modes, individually identifying modes separated temporally by only 30~ps. A single-pixel camera operating in the short-wave infrared detection range is used to image the 1550~nm wavelength optical modes. With this technique, examination of these optical modes can be performed with significantly higher temporal resolution than is possible with conventional imaging systems, such that the imaging of modes separated by spin-orbit coupling is achieved and evaluated. Deconvolution is required to separate the instrument response from the optical mode signal, increasing the clarity and temporal resolution of the measurement system.