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Secure optical chaos communication is challenged by atmospheric turbulence. An adaptive multi-aperture receiver with a programmable optical processor (POP) effectively mitigates turbulence-induced signal degradation, enabling reliable free-space communication.

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Area of Science:

  • Optical communications
  • Secure communication systems
  • Photonics

Background:

  • Optical chaos is a promising technology for high-data-rate secure communications over shared physical channels.
  • Link nonidealities, particularly atmospheric turbulence in free-space optical (FSO) links, impair transmitter-receiver synchronization.
  • Turbulence causes beam scintillation and time-varying fading, degrading chaotic signal properties.

Purpose of the Study:

  • To experimentally investigate the impact of turbulence on chaotic signal propagation in an indoor optical link.
  • To demonstrate the mitigation of turbulence-induced degradation using an adaptive multi-aperture receiver.
  • To validate the feasibility of chaos-based crypto-systems in turbulent FSO links.

Main Methods:

  • Experimental setup simulating atmospheric turbulence with controllable synthetic conditions.
  • Implementation of an adaptive multi-aperture receiver integrating a 2D array of optical antennas.
  • Utilization of a programmable optical processor (POP) on a silicon photonic platform within the receiver.

Main Results:

  • The adaptive multi-aperture receiver, aided by the POP, successfully mitigated turbulence-induced degradation of chaos properties.
  • The POP-assisted receiver recovered complex chaotic dynamics, maintaining high signal correlation despite significant turbulence.
  • Performance was superior compared to conventional single-aperture receivers in turbulent environments.

Conclusions:

  • Adaptive multi-aperture receivers with POPs can overcome atmospheric turbulence challenges in FSO chaos communication.
  • This technology enables the establishment and maintenance of reliable, secure communication links in turbulent FSO environments.
  • The findings support the potential for km-range chaos-based crypto-systems in practical FSO applications.