Modulation instability in a highly nonlinear fiber for discrete-time pulsed random bit generation

Area of Science:

• Nonlinear Optics
• Quantum Information Science
• High-Speed Communications

Background:

• Random number generation is crucial for secure communications and scientific simulations.
• Existing methods for high-speed random bit generation face challenges in speed and simplicity.
• Modulation instability (MI) is a nonlinear phenomenon with potential for generating complex optical states.

Purpose of the Study:

• To propose and experimentally demonstrate a simple, high-speed scheme for random bit generation using modulation instability.
• To leverage the inherent randomness of MI pulses for efficient data extraction.
• To achieve a random bit generation rate exceeding 50 Gbps.

Main Methods:

• Utilizing a highly nonlinear fiber pumped by a mode-locked laser in the anomalous dispersion regime.
• Developing modulation instability (MI) pulses with fluctuating pulse-to-pulse intensity variations.
• Extracting 5 random bits from each MI pulse at a 10 GHz repetition rate.
• Verifying the randomness of the generated bits using the National Institute of Standards and Technology (NIST) test suite.

Main Results:

• Successful experimental demonstration of the proposed MI-based random bit generation scheme.
• Achieved a random bit generation rate of 50 Gbps.
• Demonstrated extraction of 5 bits per pulse at a 10 GHz repetition rate.
• Generated random bits passed the NIST statistical test suite, confirming their high quality.

Conclusions:

• The proposed scheme offers a simple and effective method for high-speed random bit generation.
• Modulation instability in nonlinear fiber optics is a viable source for generating high-quality random numbers.
• The demonstrated 50 Gbps rate represents a significant advancement in random number generation technology for secure communication applications.