Performance analysis of various optical vortices for vertical underwater optical wireless communication using...

Area of Science:

• Optical Engineering
• Oceanography
• Wireless Communication

Background:

• Underwater optical wireless communication (VUOWC) faces challenges from absorption, scattering, and turbulence.
• Accurate channel modeling is crucial for reliable underwater communication systems.

Purpose of the Study:

• To develop and validate a simulation-based approach for VUOWC.
• To investigate the performance of different optical vortex beams in a realistic underwater channel.
• To identify optimal beam types for long-range, high-reliability VUOWC.

Main Methods:

• Developed a simulation using multi-phase-screen modeling for VUOWC.
• Incorporated ocean absorption, scattering, and vertical turbulence up to 100m depth.
• Utilized real-world temperature and salinity data for phase screen generation.
• Evaluated single charge vortex beam, vortex dipole beam, and sine-hyperbolic Gaussian vortex beam (ShGvB).

Main Results:

• The sine-hyperbolic Gaussian vortex beam (ShGvB) demonstrated superior performance.
• ShGvB exhibited the smallest beam wander and scintillation index.
• Lowest bit error rate (BER) was achieved with ShGvB over the entire propagation distance.

Conclusions:

• The ShGvB is a promising candidate for high-reliability, long-range VUOWC applications.
• The developed simulation accurately models underwater optical channel conditions.
• This research provides valuable insights for designing future underwater communication systems.