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375-nm ultraviolet-laser based non-line-of-sight underwater optical communication
Optics Express
|May 27, 2018
Summary
This study shows non-line-of-sight (NLOS) underwater wireless optical communication (UWOC) is feasible using ultraviolet lasers. Shorter wavelengths and higher turbidity reduce path loss, enhancing communication in challenging waters.
Area of Science:
- Optics
- Marine Technology
- Optical Engineering
Background:
- Underwater wireless optical communication (UWOC) typically requires line-of-sight (LOS) alignment.
- This limits its application in complex underwater environments.
Purpose of the Study:
- To demonstrate a non-line-of-sight (NLOS) UWOC link.
- To investigate the impact of parameters like water turbidity and wavelength on link performance.
Main Methods:
- Utilized a 375-nm ultraviolet (UV) laser for enhanced scattering.
- Analyzed path loss as a key performance metric.
- Evaluated the effects of geometric configurations and water turbidity.
Main Results:
- Path loss decreased with smaller azimuth angles and higher water turbidity.
- Shorter wavelengths, specifically 375-nm UV, significantly reduced path loss due to enhanced scattering.
- Demonstrated the feasibility of NLOS UWOC in turbid conditions.
Conclusions:
- NLOS UWOC is achievable and can be enhanced using UV lasers.
- The findings support the potential for long-distance NLOS UWOC in environments like harbor water.
- Optimizing wavelength and considering turbidity are crucial for robust underwater optical communication.
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