OAM Light Demultiplexing from an Intensity Profile using Orthogonality Renormalization of Pair Modes

TL;DR

This paper introduces a novel demultiplexing method for OAM light modes using orthogonality renormalization, enabling efficient multi-channel communication without extra optical components.

Contribution

The proposed method allows direct demultiplexing from intensity profiles, simplifying OAM communication systems and improving efficiency by eliminating additional optical elements.

Findings

Simulation results demonstrate effectiveness under various conditions.

Method achieves accurate mode separation without extra optical structures.

Improves communication performance by leveraging orthogonality renormalization.

Abstract

Orbital Angular Momentum (OAM) of light is a promising degree of freedom for next-generation communication. By exploiting the orthogonality of OAM modes, multi-channel division enables a linearly increase in communication performance proportional to the number of available modes. However, the multiplexing and demultiplexing of each superposition state remain essential yet complex processes. Demultiplexing has been established through spatial-domain methods that require additional optical elements such as gratings and apertures, which can decrease communication efficiency and accuracy under various conditions. In this paper, we propose a demultiplexing method under a single intensity profile by orthogonality renormalization of OAM pair states. This method can be applied directly to an OAM multichannel communication system without additional receiver-side optical structure. We present simulation results of our method under various conditions.