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Laser-based white-light source utilizing wavelength multiplexing for underwater high-speed wireless optical
Optics Express
|May 4, 2026
Summary
A new underwater white laser source (WLS) offers dual functionality for high-speed optical communication and clear illumination. This innovative WLS achieves high data rates for underwater wireless optical communication (UWOC) and provides high-fidelity white light for subsea applications.
Area of Science:
- Optoelectronics
- Underwater communication
- Photonics
Background:
- Underwater wireless optical communication (UWOC) systems require reliable light sources for data transmission.
- High-fidelity illumination is crucial for subsea exploration and operations.
- Integrating communication and illumination functions can enhance efficiency in underwater applications.
Purpose of the Study:
- To develop and demonstrate a dual-purpose underwater white laser source (WLS).
- To achieve high-speed data transmission via UWOC.
- To provide high-fidelity white illumination for underwater environments.
Main Methods:
- Combined red, green, and blue laser diodes (RGB LDs) with a yellow diode-pumped solid-state laser (Y-DPSSL) using wavelength-division multiplexing (WDM).
- Implemented 16-quadrature amplitude modulation discrete multitone (16-QAM DMT) for UWOC.
- Evaluated illumination quality using correlated color temperature (CCT), color rendering index (CRI), CIE coordinates, and illuminance measurements.
Main Results:
- Achieved data rates of 4 Gbps, 6 Gbps, and 6 Gbps for RGB LDs, with bit error rates (BERs) below the forward error correction (FEC) threshold.
- Demonstrated high-fidelity white illumination with a CCT of 6371 K, CRI of 79.5, and illuminance of 7984 lux.
- Confirmed the system's dual capability for both high-speed communication and illumination.
Conclusions:
- The developed WLS successfully integrates high-speed UWOC and high-fidelity illumination.
- The WLS shows significant potential for advanced subsea applications requiring both communication and lighting.
- This technology paves the way for more efficient and capable underwater systems.
