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High-frequency chaotic dynamics enabled by optical phase-conjugation.

Émeric Mercier1,2, Delphine Wolfersberger1,2, Marc Sciamanna1,2

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Replacing conventional optical feedback with phase-conjugate feedback in semiconductor lasers significantly boosts chaos bandwidth by up to 27%. This advancement offers enhanced performance for applications like secure communications and random number generation.

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Area of Science:

  • Nonlinear dynamics
  • Semiconductor laser physics
  • Photonics

Background:

  • Wideband chaos in semiconductor lasers is crucial for applications like random number generation and encrypted communications.
  • Conventional optical feedback methods have limitations in achieving desired chaos bandwidths.
  • Phase-conjugate feedback is an alternative approach to modulate laser dynamics.

Purpose of the Study:

  • To investigate the effect of phase-conjugate feedback on the chaos bandwidth of semiconductor lasers.
  • To compare the performance of phase-conjugate feedback with conventional optical feedback.
  • To understand the underlying dynamics responsible for bandwidth enhancement.

Main Methods:

  • Experimental setup utilizing a semiconductor laser with phase-conjugate feedback.
  • Time-resolved frequency dynamics measurements on nanosecond timescales.
  • Analysis of chaotic itinerancy and external cavity mode destabilization.

Main Results:

  • Phase-conjugate feedback increases chaos bandwidth by up to 27% compared to conventional mirrors.
  • Bandwidth enhancement is linked to self-pulsing solutions at harmonics of the external-cavity frequency.
  • Observed chaotic itinerancy among destabilized high-frequency external-cavity modes.

Conclusions:

  • Phase-conjugate feedback offers a superior method for enhancing chaos bandwidth in semiconductor lasers.
  • The unique dynamics observed are specific to phase-conjugate feedback, differentiating it from time-delayed feedback.
  • This technique holds promise for advancing applications requiring wideband chaos, such as secure communications.