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Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Laser physics

Background:

  • Optical localized states are typically intensity-based light pulses in nonlinear systems.
  • Controlling these states is crucial for optical information processing.

Purpose of the Study:

  • To experimentally and analytically demonstrate longitudinal localized states in the phase of laser light.
  • To explore their potential as information units in coherent communication.

Main Methods:

  • Utilizing an injection-locked semiconductor laser with delayed feedback.
  • Operating the laser in a neuron-like excitable regime.
  • Employing analytical modeling to confirm experimental observations.

Main Results:

  • Demonstrated the existence of robust and controllable longitudinal phase bits.
  • Showcased individual nucleation and cancellation of these phase bits.
  • Confirmed their topological nature and analogy to Sine-Gordon solitons.

Conclusions:

  • Phase-based optical localized states are achievable and controllable.
  • These 'phase bits' offer a new paradigm for optical information units.
  • Potential applications in next-generation coherent communication systems.