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Bidirectional chaos communication between two outer semiconductor lasers coupled mutually with a central

Ping Li¹, Jia-Gui Wu, Zheng-Mao Wu

¹School of Physics, Southwest University, Chongqing 400715, China.

|November 24, 2011

Summary

Researchers achieved stable chaos synchronization between two outer semiconductor lasers, enabling secure 20 Gbit/s bidirectional communication. This study explores novel decoding schemes for high-speed data transmission using synchronized laser systems.

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Area of Science:

Optics and Photonics
Nonlinear Dynamics
Secure Communications

Background:

Chaos synchronization in coupled semiconductor lasers is crucial for secure communication systems.
Previous methods often rely on chaos pass filtering, limiting transmission rates.
Investigating mutual coupling in a linear chain of three lasers offers a new approach.

Purpose of the Study:

To investigate chaos synchronization and bidirectional communication in a three-laser linear chain.
To achieve high-quality, stable synchronization between outer lasers with minimal correlation to the central laser.
To demonstrate high-speed bidirectional data transmission using a novel decoding scheme.

Main Methods:

Simulated a linear chain of three semiconductor lasers with mutual coupling between the central and outer lasers.
Analyzed synchronization quality using cross-correlation coefficients.
Implemented and evaluated a novel decoding scheme for bidirectional data transmission.

Main Results:

Achieved high-quality and stable isochronal chaos synchronization between the two outer lasers.
Demonstrated very low cross-correlation coefficients between outer and central lasers under proper conditions.
Realized bidirectional data transmission at bit rates up to 20 Gbit/s.

Conclusions:

The proposed three-laser system effectively achieves robust chaos synchronization.
The novel decoding scheme enables high-speed, secure bidirectional communication surpassing previous limitations.
The study highlights the potential of coupled chaotic lasers for advanced communication technologies.