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. 2017 Jan 17;7:40480. doi: 10.1038/srep40480

Figure 6. Maximal allowable capacities and optimized transmission parameters of 6.8- and 10.2-m UWOC links by changing tap water to seawater.

Figure 6

(a) Image of seawater. (b) EVMs of 16-QAM OFDM data at different bandwidths for blue LD-based UWOC system in seawater. (c) SNR responses and related constellation plots of 6.8- and 3.6-Gbps 16-QAM OFDM data after 6.8- and 10.2-m seawater transmissions, respectively. (d) Average EVMs of 7.2-Gbps/6.8-m and 4-Gbps/10.2-m UWOC system-delivered 16-QAM OFDM data at various pre-leveling slopes. (e) Subcarrier SNRs and corresponding constellation plots of 7.2-Gbps/6.8-m and 4-Gbps/10.2-m pre-leveled 16-QAM OFDM data. (f) Data rate to distance responses of tap water and seawater-based UWOC systems.

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