Underwater wireless optical communication employing polarization multiplexing modulation and photon counting...

Area of Science:

• Optics and Photonics
• Underwater Communication Systems
• Quantum Information

Background:

• Underwater wireless optical communication (UWOC) is vital for high-speed data transmission.
• Existing UWOC systems face challenges in performance over water channels.
• Polarization multiplexing and photon counting offer potential improvements.

Purpose of the Study:

• To analyze and improve underwater wireless optical communication (UWOC) performance.
• To investigate the use of polarization multiplexing modulation and photon counting detection.
• To establish a theoretical model and experimental validation for UWOC systems.

Main Methods:

• Constructed a theoretical communication model for polarization multiplexing UWOC with photon counting.
• Analyzed polarization maintenance characteristics using Mueller matrix, quantum state fidelity, and depolarization ratio.
• Calculated ratios of ballistic photons to assess channel properties.
• Designed and developed an experimental UWOC system.

Main Results:

• Demonstrated polarization maintenance characteristics of photons in water channels.
• Achieved data transmission rates of 14.58 Mbps using polarization on-off keying multiplexing.
• Achieved data transmission rates of 7.29 Mbps using polarization 2-pulse-position multiplexing.
• Validated theoretical improvements in bit error rates and communication capacities.

Conclusions:

• Polarization multiplexing modulation combined with photon counting detection significantly enhances UWOC performance.
• The developed experimental system demonstrates high data transmission rates over a 92m water channel.
• This approach offers a promising solution for reliable and high-speed underwater data transmission.