Femtosecond Filament Coupled with Structured Light for Free Space Optical Communication

TL;DR

This paper introduces a robust free-space optical communication method using femtosecond filaments coupled with structured light beams, enhancing capacity and resilience in challenging atmospheric conditions.

Contribution

It presents a novel approach combining femtosecond filaments with structured light, including vortex beams, for improved free-space optical communication.

Findings

Developed a 4-bit communication channel using structured light.

Demonstrated resilience of the system to noise and filament disruptions.

Introduced segmented space division multiplexing for scalability.

Abstract

The generation of a laser filament through clouds produces a shockwave which displaces the small water droplets from the air to create a quasi-transparent channel through which, information can be transmitted. We present a robust method that utilizes the channel for free-space optical communication using structured light beams coupled with a femtosecond filament. Vortex beams based on their spatial profiles and non-diffractive characteristics are perfectly suited to propagate around the filament. We have also developed a 4-bit communication channel using these structured light beam. We introduce a method dubbed segmented space division multiplexing. Our system demonstrates resilience to noise and is unaffected by the filament. This method can improve the scalability, robustness, and capacity of the free optical channel.