Chaotic synchronization of a distant star-type laser network with multiple optical injections

Area of Science:

• Optics and Photonics
• Telecommunications Engineering
• Nonlinear Dynamics

Background:

• Distant star-type laser networks are crucial for secure communication.
• Achieving stable chaotic synchronization in such networks is challenging due to signal degradation over long fiber links.
• Previous methods struggled to maintain low correlation between network nodes.

Purpose of the Study:

• To introduce and evaluate a novel multi-injection module (MIM) for enhancing chaotic synchronization in distant star-type laser networks.
• To experimentally and theoretically investigate the performance of the MIM.
• To analyze the impact of MIM on correlation levels and operating conditions.

Main Methods:

• Implementation of a novel multi-injection module (MIM) in a star-type laser network.
• Experimental investigation of chaotic synchronization between a hub semiconductor laser node (H-SLN) and star semiconductor laser nodes (S-SLNs).
• Theoretical modeling to analyze synchronization conditions and the effect of MIM parameters.

Main Results:

• Achieved significantly low correlation (approx. 0.2) between H-SLN and S-SLNs in different clusters using MIM.
• Maintained low correlation (approx. 0.18) even with extended fiber links up to 80 kilometers.
• Examined the influence of injection power, frequency detuning, and mismatch on synchronization.

Conclusions:

• The novel MIM effectively reduces correlation in distant star-type laser networks, outperforming previous results.
• The MIM demonstrates robustness in maintaining low correlation over extended fiber lengths.
• Further analysis explored synchronization conditions within clusters and the impact of MIM branch configuration.