研究目的
Investigating the performance of a single photon avalanche diode (SPAD) receiver based underwater wireless optical communication (UWOC) system to achieve long-distance communication.
研究成果
The study demonstrates that employing a SPAD can effectively promote the development of long-distance UWOC, with maximum estimated distances of 144 m and 117 m at data transmission rates of 500 bps and 2 Mbps, respectively. The small laser divergence angle and high sensitivity of the SPAD contribute to achieving long-distance communication.
研究不足
The study simulates long-distance UWOC using ND filters rather than actual long-distance underwater channels. The divergence angle was measured in free space and assumed similar underwater, which may not account for all underwater conditions.
1：Experimental Design and Method Selection:
A blue LD was used as the light source, and a SPAD-based receiver was used as the detector in the UWOC system. A series of neutral density (ND) filters were exploited to attenuate the light output power to simulate long-distance UWOC.
2：Sample Selection and Data Sources:
The system was tested with different distances and data transmission rates to obtain BER and SNR performance.
3：List of Experimental Equipment and Materials:
Blue LD (Thorlabs, PL450B), SPAD receiver, ND filters, Fresnel lens, optical power meter, digital signal oscilloscope (DSO).
4：Experimental Procedures and Operational Workflow:
The light output power was measured at the receiver side, and the BER was calculated by a MATLAB program. The signal was processed either by the internal counter of the SPCM or by a DSO and MATLAB program for higher data rates.
5：Data Analysis Methods:
The BER and SNR were calculated based on the received photon counts and noise levels.
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blue LD
PL450B
Thorlabs
Used as the light source in the UWOC system.
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SPAD
Used as the detector in the UWOC system for high sensitivity photon detection.
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ND filters
Used to attenuate the light output power to simulate long-distance UWOC.
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Fresnel lens
Used to focus the transmitted light beam at the receiver side.
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optical power meter
Used to measure the light output power at the receiver side.
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digital signal oscilloscope (DSO)
Used to obtain output pulses at data rates higher than 500 kbps.
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