Erasure of Time Delay Signatures in the Output of an Optoelectronic Feedback Laser with Modulated Delays and Chaos Synchronization

TL;DR

This paper demonstrates that modulated feedback delays can erase time delay signatures in optoelectronic lasers, enhancing their potential for secure chaos-based communication, and reports on chaos synchronization in coupled laser systems.

Contribution

It introduces the concept of erasing time delay signatures via modulation and reports the first chaos synchronization in coupled lasers with modulated delays.

Findings

Time delay signatures can be erased with feedback modulation.

Chaos synchronization achieved in coupled lasers with modulated delays.

Potential for improved secure communication systems.

Abstract

By studying the autocorrelation function of the optoelectronic feedback semiconductor laser output we establish that the signatures of time delays can be erased in systems incorporating modulated feedback time delays. This property is of importance for the suitability of such laser systems for secure chaos-based communication systems. We also make the first report on chaos synchronization in both unidirectionally and bidirectionally coupled multiple time delay chaotic semiconductor lasers with modulated optoelectronic feedbacks.