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title: ""To enable high-speed underwater wireless optical communication…"
date: 2019-01-25
source: facebook
type: Archer T. Ships shared a link.
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# "To enable high-speed underwater wireless optical communication…

*January 25, 2019 · Facebook*

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[https://www.nature.com/articles/srep40480](https://www.nature.com/articles/srep40480){target="_blank"}
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\"To enable high-speed underwater wireless optical communication (UWOC) in tap-water and seawater environments over long distances, a 450-nm blue GaN laser diode (LD) directly modulated by pre-leveled 16-quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) data was employed to implement its maximal transmission capacity of up to 10 Gbps. The proposed UWOC in tap water provided a maximal allowable communication bit rate increase from 5.2 to 12.4 Gbps with the corresponding underwater transmission distance significantly reduced from 10.2 to 1.7 m, exhibiting a bit rate/distance decaying slope of −0.847 Gbps/m. When conducting the same type of UWOC in seawater, light scattering induced by impurities attenuated the blue laser power, thereby degrading the transmission with a slightly higher decay ratio of 0.941 Gbps/m. The blue LD based UWOC enables a 16-QAM OFDM bit rate of up to 7.2 Gbps for transmission in seawater more than 6.8 m.\"\
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[https://www.nature.com/articles/srep40480](https://www.nature.com/articles/srep40480){target="_blank"}
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