34.5 m underwater optical wireless communication with 2.70 Gbps data rate based on a green laser diode with NRZ-OOK...

Area of Science:

• Optical Engineering
• Wireless Communication
• Oceanography

Background:

• Traditional underwater wireless communication faces limitations in speed and distance.
• Underwater optical wireless communication (UOWC) offers a promising alternative for enhanced data transmission.
• Developing efficient UOWC systems is crucial for expanding underwater connectivity.

Purpose of the Study:

• To propose and experimentally demonstrate a low-power green laser diode (LD) based UOWC system.
• To achieve high-speed and long-distance data transmission underwater.
• To evaluate the system's performance for real-time UOWC applications.

Main Methods:

• Utilized a 520 nm green laser diode (LD) for UOWC.
• Employed a non-return-to-zero on-off keying (NRZ-OOK) modulation scheme.
• Conducted experiments to measure data rates at various underwater distances.

Main Results:

• Achieved a maximum communication capacity of 2.70 Gbps over a 34.5 m distance.
• Demonstrated data rates up to 4.60 Gbps at 2.3 m and 3.48 Gbps at 20.7 m.
• Estimated an allowable transmission distance of ~90.7 m at 0.15 Gbps with a BER of 2.0 ×10^-6.

Conclusions:

• The proposed LD-based UOWC system effectively enables high-speed, long-distance underwater communication.
• The system's performance is suitable for applications demanding real-time, high-capacity data transfer underwater.
• This technology supplements traditional methods, paving the way for advanced underwater networking.