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Random number generator based on an integrated laser with on-chip optical feedback.

Guy Verschaffelt1, Mulham Khoder1, Guy Van der Sande1

  • 1Applied Physics Research Group, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.

Chaos (Woodbury, N.Y.)
|December 3, 2017
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Summary

Researchers developed a compact laser with a 10 cm on-chip optical feedback section. This laser generates random bits at 500 Mbits/s by leveraging chaotic dynamics from controlled optical feedback.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Chaos Theory Applications

Background:

  • On-chip optical feedback lasers are crucial for advanced photonic integrated circuits.
  • Achieving long feedback lengths on-chip presents significant design and fabrication challenges.
  • Chaotic dynamics in lasers offer potential for high-speed random number generation.

Purpose of the Study:

  • To design and test a laser with an integrated, long on-chip optical feedback section.
  • To demonstrate the feasibility of fabricating such a device using standard photonic integration platforms.
  • To explore the use of chaotic dynamics for high-speed random bit generation.

Main Methods:

  • Fabrication of a laser device and a 10 cm optical feedback section on a generic photonic integration platform.
  • Integration of the long feedback section within a compact 5.5 mm² footprint.
  • Control of optical feedback to induce chaotic dynamics in the long-cavity regime.

Main Results:

  • Successful integration of a 10 cm feedback length within a 5.5 mm² footprint.
  • Achievement of controllable chaotic dynamics by adjusting the optical feedback.
  • Demonstration of random bit generation from chaotic intensity fluctuations at a rate of 500 Mbits/s.

Conclusions:

  • A compact laser with a long on-chip optical feedback section can be fabricated using standard building blocks.
  • The device exhibits complex chaotic dynamics suitable for secure random number generation.
  • This work paves the way for high-speed, on-chip random bit generators in photonic systems.