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Real-time stealth optical transmission via fast laser frequency dithering
Optics Express
|February 1, 2024
Summary
We demonstrate a 150 kbps stealth data transmission embedded within a 10 Gbps optical communication system. This novel method minimally impacts the public channel, offering enhanced security for optical networks.
Area of Science:
- Optical Communications
- Information Security
- Signal Processing
Background:
- High-speed optical communication systems are vulnerable to unauthorized access.
- Secure data transmission is crucial for modern communication networks.
- Integrating covert channels can enhance existing security measures.
Purpose of the Study:
- To develop a stealth data transmission method within public optical communication systems.
- To assess the feasibility and impact of stealth transmission on existing infrastructure.
- To enhance the security and signaling capabilities of optical networks.
Main Methods:
- Modulating stealth data onto the frequency tuning signals of a fast-tuning laser source.
- Utilizing Quadrature Phase-Shift Keying (QPSK) Digital Signal Processing (DSP) algorithms for data recovery.
- Conducting experiments over a 300 km transmission distance.
Main Results:
- Achieved a real-time stealth transmission rate of 150 kbps.
- Demonstrated minimal impact on the 10 Gbps dual polarization QPSK public channel.
- Successfully recovered stealth data from frequency offset estimations.
Conclusions:
- The proposed stealth transmission is compatible with existing optical systems, requiring only laser upgrades.
- This method enhances system security when combined with cryptographic protocols.
- It can serve as a signaling transport for network control, reducing overhead.
