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Simplified coherent chaotic optical secure communication scheme based on the Kramers-Kronig receiver
Optics Letters
|August 29, 2024
Summary
This study introduces a simplified chaotic optical communication system for secure fiber-optic networks. It achieves high-quality synchronization for enhanced physical layer encryption, offering a cost-effective solution.
Area of Science:
- Optical Communications
- Physical Layer Security
- Secure Networks
Background:
- Enhancing physical layer encryption in fiber-optic networks is crucial for data security.
- Current methods often require complex device setups.
Purpose of the Study:
- To propose a simplified coherent chaotic secure optical communication scheme.
- To demonstrate a cost-effective approach for physical layer encryption.
Main Methods:
- Utilized a semiconductor laser with phase-conjugated optical feedback as a common chaotic source.
- Achieved high-quality chaotic signal synchronization (30.6 GHz bandwidth) between transmitter and receiver slave lasers.
- Employed a Kramers-Kronig (KK) receiver with offline digital signal processing (DSP) for signal recovery.
Main Results:
- Successfully demonstrated secure transmission of a 20 Gbaud 16-level quadrature amplitude modulation (16QAM) signal over a 50 km standard single-mode fiber (SSMF) link.
- The simplified scheme achieved broad chaotic synchronization.
- The KK receiver enabled effective signal compensation and recovery.
Conclusions:
- The proposed scheme simplifies device requirements for chaotic coherent optical secure communication.
- This offers a cost-effective and promising path for advancing physical layer encryption in inter-data center communications.
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