Semiconductor-laser-based hybrid chaos source and its application in secure key distribution.

Area of Science:

• Optoelectronics
• Information Security
• Nonlinear Dynamics

Background:

• Existing optical chaos sources face challenges in robustness and system complexity.
• Secure key distribution (SKD) requires reliable and complex chaotic signals for enhanced security.
• Integration of analog and digital components in optical systems presents design hurdles.

Purpose of the Study:

• To propose and demonstrate an analog-digital hybrid optical chaos source.
• To develop a compatible secure key distribution (SKD) scheme utilizing the proposed source.
• To enhance the robustness and simplify the structure of optical chaos generation for SKD.

Main Methods:

• An analog-digital hybrid electro-optic feedback loop was introduced to stabilize chaotic semiconductor lasers.
• The system was designed to generate broadband analog optical chaotic signals with high dynamical complexity.
• A secure key distribution (SKD) system was built and tested using the developed chaos source.

Main Results:

• The proposed hybrid chaos source demonstrated enhanced robustness and simplified system structure.
• The source generated broadband optical chaotic signals with high dynamical complexity.
• The compatible SKD scheme proved insensitive to fiber optic link impairments, suitable for digital networks.

Conclusions:

• The analog-digital hybrid optical chaos source offers a robust and simplified solution for secure key distribution.
• The compatibility with digital optical networks and insensitivity to link impairments suggest potential for long-haul SKD.
• This approach reduces processing speed requirements for digital components, facilitating practical implementation.