Time-delay signature concealed broadband gain-coupled chaotic laser with fiber random grating induced distributed feedback

TL;DR

This paper presents a broadband chaotic laser system with a flat spectrum up to 8.5GHz, achieved through fiber random grating feedback, which suppresses time-delay signatures and enhances applications in secure communications and random number generation.

Contribution

The study introduces a gain-coupled chaotic laser with fiber random grating feedback that significantly broadens bandwidth and eliminates time-delay signatures, improving practical security applications.

Findings

Achieved flat power spectrum up to 8.5GHz.

Realized more than threefold bandwidth enhancement.

Suppressed time-delay signatures in the chaotic laser output.

Abstract

A broadband chaotic laser with a flat power spectrum extending up to 8.5GHz is achieved by injecting continuous wave laser light into a chaotic diode laser perturbed by fiber random grating induced distributed feedback, which forms a gain-coupled chaotic laser system. More than triple bandwidth enhancement is realized with appropriate frequency detuning between the master and slave lasers. Unlike normal chaotic lasers, the output from such a broadband chaotic laser is free from time-delay signature, which can be applied for practical real-time random number generations and will find useful applications in the fields of information security and computation systems.