Dithered Time Delays and Chaos Synchronization in Lasers with Multiple Feedbacks

TL;DR

This paper explores how laser systems with multiple variable time delays can hide delay signatures, enhancing security for chaos-based communication, and demonstrates chaos synchronization in coupled laser diodes with feedbacks.

Contribution

It introduces the concept of variable multiple time delays to conceal delay signatures and reports the first chaos synchronization in such laser systems.

Findings

Delay signatures can be erased in autocorrelation and mutual information.

Chaos synchronization achieved in unidirectional and bidirectional coupled lasers.

Potential for secure chaos-based communication systems.

Abstract

By studying laser systems with multiple time delays, we demonstrate that the signatures of time delays in the autocorrelation coefficient and the mutual information of the laser output can be erased for systems with variable time delays. This property makes such laser systems highly suitable for secure chaos-based communication systems. We also present the first report on chaos synchronization in both unidirectionally and bidirectionally coupled variable multiple time delay laser diodes with electro-optical feedbacks.