研究目的
To investigate the practical performance and prospects of underwater optical wireless communication, including optical characteristics of seawater and communication tests with a prototype modem.
研究成果
The research confirms that UOWC is practical for high-speed communications up to 200 m range, with successful tests achieving 20 Mbps at 120 m and remote desktop connections. The developed profiler and modem provide valuable insights into optical characteristics and performance predictions, paving the way for underwater IoT applications. Future work should focus on improving stability with gimbal mounts and developing modems with omnidirectional directivity.
研究不足
The study is limited by external noise such as sunlight and ambient light, axis alignment errors due to platform instability, and the difficulty in achieving long-distance communications beyond 200 m. Performance is highly dependent on water conditions like turbidity and chlorophyll content.
1：Experimental Design and Method Selection:
The study involved designing a profiler for underwater optics to measure optical characteristics and developing a prototype UOWC modem for communication tests. Methods included optical attenuation measurements using Beer-Lambert's law and radiative transfer equation, and communication tests using intensity modulation and direct detection (IM/DD) with on-off keying (OOK) modulation.
2：Sample Selection and Data Sources:
Measurements were taken 33 times at 17 sea areas and a dam lake from 2016 to 2018, using the profiler to collect data on turbidity, chlorophyll, transmittance, and reflectance.
3：List of Experimental Equipment and Materials:
Profiler for underwater optics, prototype UOWC modem with laser diodes (LDs), avalanche photodiodes (APD), photomultiplier tubes (PMT), optical bandpass filters, pressure-proof housings, and a high-speed towing tank.
4：Experimental Procedures and Operational Workflow:
The profiler was deployed to measure optical properties at various depths. The modem was tested in sea and pool environments, with varying beam widths, colors, and communication speeds, while monitoring external factors like ambient light and platform stability.
5：Data Analysis Methods:
Data were analyzed using exponential regressions for relationships between turbidity/chlorophyll and transmittance, and theoretical calculations based on optical power and signal-to-noise ratios.
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