Random bit generation using an optically injected semiconductor laser in chaos with oversampling.

Area of Science:

• Optics and Photonics
• Information Security
• Semiconductor Device Physics

Background:

• High-speed random bit generation is crucial for cryptography and secure communications.
• Existing methods often require complex postprocessing or stringent electronic bandwidth.
• Semiconductor lasers driven into chaos offer a potential source of high-entropy random numbers.

Purpose of the Study:

• To demonstrate a novel method for random bit generation using optically injected chaotic semiconductor lasers.
• To achieve high bit rates without complex postprocessing or demanding electronic requirements.
• To explore the potential of chaotic laser dynamics for practical random number generation.

Main Methods:

• Experimentally driving a semiconductor laser into chaos via optical injection.
• Utilizing the inherently low autocorrelation of the chaotic waveform.
• Digitizing the chaotic output at a 10 GHz sampling rate and processing 3 least significant bits per sample.

Main Results:

• Successful demonstration of random bit generation from a chaotic semiconductor laser.
• Achieved an output bit rate of 30 Gbps.
• The method requires no complicated postprocessing and has relaxed electronic bandwidth requirements.

Conclusions:

• Optically injected chaotic semiconductor lasers provide a viable and efficient source for high-speed random bit generation.
• The proposed technique offers a practical solution for generating random numbers with high throughput and minimal complexity.
• This approach has significant implications for secure communication and random number generation applications.