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Optical orbital-angular-momentum-multiplexed data transmission under high scattering.

Lei Gong1, Qian Zhao1, Hao Zhang1

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A new scattering-matrix-assisted retrieval technique (SMART) effectively demultiplexes orbital angular momentum (OAM) channels in scattered light. This method achieves low crosstalk for high-capacity optical communication, even in turbulent environments.

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Area of Science:

  • Optical Communications
  • Photonics
  • Signal Processing

Background:

  • Multiplexing orbital angular momentum (OAM) channels is key for high-capacity optical communication.
  • Scattering and mode coupling degrade OAM channel orthogonality, increasing crosstalk.

Purpose of the Study:

  • To develop a novel technique for demultiplexing OAM channels from highly scattered optical fields.
  • To improve the performance and robustness of OAM-based optical communication systems.

Main Methods:

  • Proposed a scattering-matrix-assisted retrieval technique (SMART).
  • Implemented SMART in a digital micromirror device-based system for OAM encoding and reference-free calibration.
  • Tested the system's performance in sorting 24 OAM channels through a scattering medium.

Main Results:

  • Achieved experimental crosstalk of -13.8 dB in parallel sorting of 24 OAM channels.
  • Demonstrated high-fidelity transmission of gray and color images with an error rate below 0.08% under scattering conditions.
  • The system exhibited high tolerance to misalignment.

Conclusions:

  • SMART enables effective OAM demultiplexing in highly scattered optical fields.
  • This technique offers a pathway to high-performance optical communication in challenging, turbulent environments.
  • The developed system shows promise for practical applications in optical data transmission.