Spontaneous Chaotic Microlasers for Random Number Generation

TL;DR

This paper introduces a novel spontaneous chaotic microlaser that generates high-speed true random numbers through mode interactions, offering a robust and controllable optical chaos source for secure communications.

Contribution

First demonstration of a spontaneous chaotic microlaser caused by nearly degenerate mode interactions, enabling high-speed random number generation.

Findings

Achieved 10 Gb/s true random number generation.

Designed a circular-side hexagonal microlaser with GHz mode intervals.

Demonstrated controllable and robust optical chaos in a solitary laser.

Abstract

Chaotic semiconductor lasers have been widely investigated for generating true random numbers with the merit of unpredictability relative to pseudorandom numbers generated by a computing process, especially for the lasers with external optical feedback. Here, we report the first spontaneous chaotic microlaser due to the interaction of nearly degenerate modes. The circular-side hexagonal microlaser is designed and demonstrated with adjusted mode intervals in the order of GHz for the fundamental and the first order transverse modes. Four modes including degenerate modes with strong mode beating will result in chaos. True random numbers at 10Gb/s is obtained from the laser output power with a high dimension of 5.46. Our finding provides a novel and easy way to create controllable and robust optical chaos for high speed random number generation, which also paves the way for the nonlinear dynamics in a solitary laser.