Time-variant signal encryption by lensless dual random phase encoding applied to fiber optic links

Area of Science:

• Optoelectronics
• Information Security
• Optical Communications

Background:

• Secure data transmission is critical for modern communication networks.
• Existing encryption methods face challenges in bandwidth and complexity.
• Fiber optic links are essential for high-speed data transfer.

Purpose of the Study:

• To propose and analyze a novel lensless dual random phase encoding technique.
• To evaluate its suitability for secure data transmission in short-haul fiber optic links.
• To investigate signal broadening effects and bandwidth limitations.

Main Methods:

• Utilizing a lensless dual random phase encoding technique in the temporal domain.
• Analyzing signal broadening in time and frequency domains using the Wigner distribution function.
• Employing quasi-white noise with a defined bandwidth for signal encryption.

Main Results:

• Demonstrated good system performance through numerical simulations.
• Successfully limited the bandwidth of the encrypted signal.
• Analyzed the impact of encoding stages on signal characteristics.

Conclusions:

• The proposed multiplexing encryption method is a viable alternative to established techniques.
• The technique shows potential for secure short-haul fiber optic data transmission.
• Further research can explore optimization and broader applications.