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Parallel random bit generation based on a multi-longitudinal-mode self-chaotic semiconductor microcavity laser.

Yong-Shi Luo, Xiang Li, Zun-Hao Hu

|May 4, 2026

Summary

This summary is machine-generated.

Researchers developed a new method for faster random bit generation using parallel chaotic sources from a single laser. This approach simplifies systems and significantly increases the generation rate, making it ideal for high-speed applications.

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Area of Science:

Photonics and Optical Engineering
Information Security and Cryptography

Background:

High-speed random bit generation is crucial for modern cryptography and secure communications.
Parallel chaotic sources are effective for increasing random bit generation rates.
Semiconductor lasers are promising sources for chaotic random bit generation.

Purpose of the Study:

To propose and validate a novel method for multi-channel random bit generation using longitudinal modes of a self-chaotic semiconductor microcavity laser.
To investigate the impact of retaining least significant bits (LSBs) on inter-mode correlation.
To achieve high random bit generation rates with a simplified system.

Main Methods:

Utilizing multiple longitudinal modes of a self-chaotic semiconductor microcavity laser as parallel chaotic sources.
Applying least significant bit (LSB) retention as a post-processing step to reduce inter-mode correlation.
Collecting signals at a 10 GSa/s sampling rate from three longitudinal modes.
Performing statistical tests using National Institute of Standards and Technology (NIST) Special Publication 800-22.

Main Results:

Retaining 5 or fewer LSBs effectively eliminates correlation between longitudinal modes.
Random bit streams retained up to 5 LSBs passed NIST statistical tests without additional post-processing.
A random bit generation rate of 130 Gb/s was achieved using three longitudinal modes.
The proposed method significantly relaxes correlation requirements for parallel chaotic sources.

Conclusions:

Multiple longitudinal modes of a self-chaotic microcavity laser can serve as effective parallel chaotic sources for random bit generation.
LSB retention is a critical post-processing step that enables the use of these modes, simplifying the system.
This approach offers a simplified and high-rate solution for random bit generation, advancing secure communication technologies.