# Chaos Synchronization of Integrated Five-Section Semiconductor Lasers

## TL;DR

Researchers developed a method to synchronize chaotic signals from five-section semiconductor lasers, which could improve the security of optical communication systems.

## Contribution

A novel chaos synchronization scheme using five-section semiconductor lasers with matched parameters and common noise driving is proposed.

## Key findings

- The five-section semiconductor laser can generate chaotic signals over a wide range of driving currents.
- Chaos synchronization is achieved using a common noise signal between matched lasers.
- Synchronization is sensitive to current mismatches, suggesting use as secure communication keys.

## Abstract

We proposed and verified a scheme of chaos synchronization for integrated five-section semiconductor lasers with matching parameters. The simulation results demonstrated that the integrated five-section semiconductor laser could generate a chaotic signal within a large parameter range of the driving currents of five sections. Subsequently, chaos synchronization between two integrated five-section semiconductor lasers with matched parameters was realized by using a common noise signal as a driver. Moreover, it was found that the synchronization was sensitive to the current mismatch in all five sections, indicating that the driving currents of the five sections could be used as keys of chaotic optical communication. Therefore, this synchronization scheme provides a candidate to increase the dimension of key space and enhances the security of the system.