Multi-channel broadband optical chaos generation assisted by phase modulation and CFBG feedback

Area of Science:

• Optics and Photonics
• Nonlinear Dynamics
• Information Security

Background:

• Optical chaos generation is crucial for secure communication.
• Broadband chaos sources are needed for high-speed random number generation.
• Existing methods face limitations in bandwidth and generation rates.

Purpose of the Study:

• To propose a novel and simple multi-channel broadband optical chaos generation scheme.
• To enhance chaotic bandwidth using phase modulation and chirped fiber Bragg gratings (CFBG).
• To achieve high-speed multi-channel physical random number generation.

Main Methods:

• Utilizing phase modulation to broaden the spectrum of phase chaos.
• Employing CFBG for dispersion, chaos conversion, and bandwidth enhancement.
• Introducing wavelength detuning for further bandwidth improvement.

Main Results:

• Achieved 10 dB bandwidths up to 40 GHz across five channels.
• Generated multi-channel physical random numbers at a total rate of 4.64 Tbit/s.
• Demonstrated the highest recorded random number generation rate using external cavity feedback semiconductor lasers.

Conclusions:

• The proposed scheme effectively generates broadband multi-channel optical chaos.
• The method significantly enhances chaotic bandwidth and random number generation speed.
• This technology holds great potential for next-generation Tbit/s secure optical communication systems.