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Coherent optical wireless communication link employing orbital angular momentum multiplexing in a ballistic and
Optics Letters
|February 1, 2019
Summary
Scattering significantly impacts optical wireless communication links using orbital angular momentum (OAM). Power loss dominates in ballistic scattering, while diffusive scattering increases crosstalk, degrading performance.
Area of Science:
- Optical wireless communication
- Free-space optics
- Information theory
Background:
- Orbital angular momentum (OAM) multiplexing offers high-capacity optical wireless communication.
- Scattering in the atmosphere can degrade the performance of free-space optical links.
- Understanding scattering effects is crucial for reliable OAM-based communication.
Purpose of the Study:
- To experimentally investigate the impact of scattering on an 80 Gbit/s OAM-multiplexed optical wireless communication link.
- To analyze the performance degradation under varying scattering conditions (ballistic to diffusive).
- To identify the primary impairments caused by scattering for different OAM modes.
Main Methods:
- Experimental setup for an 80 Gbit/s OAM-multiplexed optical wireless communication link.
- Controlled introduction of scattering levels from ballistic to diffusive regimes.
- Measurement and analysis of power loss, mode purity, crosstalk, and bit error rate (BER).
Main Results:
- In ballistic scattering, power loss is the primary performance limitation, with minimal impact on mode purity.
- In diffusive scattering, increased crosstalk between OAM modes becomes a significant impairment.
- Performance degradation is mode-dependent and intensifies with increasing scattering levels.
Conclusions:
- Scattering effects, particularly crosstalk in diffusive regimes, pose a significant challenge for OAM-based optical wireless communication.
- Link design must account for scattering to maintain signal integrity and achieve reliable high-speed data transmission.
- Further research into mitigation techniques for scattering-induced impairments is warranted.
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