Interpreting mode degeneracy lifting in high-index-contract optical fibers as spin-orbit interaction or Imbert-Fedorov shift of orbital angular momentum modes

TL;DR

This paper offers a visual and analytical interpretation of mode degeneracy lifting in high-index-contract optical fibers, linking it to spin-orbit interaction and Imbert-Fedorov shifts of orbital angular momentum modes.

Contribution

It introduces a visual interpretation framework for mode degeneracy lifting as spin-orbit interaction and verifies it with analytical solutions.

Findings

Mode degeneracy lifting can be interpreted as spin-orbit interaction.

The Imbert-Fedorov shift explains the mode behavior.

Analytical results match eigen equation solutions.

Abstract

We present a visual interpretation of fiber mode degeneracy lifting as SOI (Imbert-Fedorov shift) of OAM modes in a ray picture, and the analytical results are verified by comparing them with eigen equation solutions.