Mohammad VJ, Pirazh K, Arvin T, Ata C.

Journal of the European Optical Society Rapid Publications, 2015 10: 15045-1- 15045-5. Research on the attenuation characteristics of some inorganic salts in seawater. Optical properties of NaCl solution within the spectral range from 300nm to 2500nm at room temperature. Optical properties of tap-water purity using He-Ne laser with different power density. Absorption and attenuation of visible and near-infrared light in water: dependence on temperature and salinity. 20 meter underwater wireless optical communication link with 1.5 Gbps data rate.

Shen C, Guo Y, Oubei HM, Ng TK, Liu G, Park K, Ho K, Alouini M, Ooi BS.

Underwater Optical Wireless Communication. For a maximum allowable Bit Error Rate (BER) of 10 -9 in UWOC, achievable link distance reduces considerably as the salt concentration increases. From the absorption coefficient values obtained from the measurements, performance of UWOC for selected samples at three wavelengths of 450nm, 550nm and 700nm with transmitter power of 30mW were evaluated by simulation using OptiSystem linked with MATLAB. From the absorption spectra obtained for each sample, the absorptivity spectrum for the table salt was obtained which shows high absorptivity at shorter wavelengths and lower absorptivity at longer wavelengths. However, the attenuation tends to increase sharply around 700nm – 800nm. Also, it was observed that at shorter wavelengths (blue light), there is higher attenuation with increase in salt concentration compared to longer wavelengths (red light). The results showed an increase in conductivity and attenuation with increase in the presence of the table salt in the water. Absorption spectra of visible light through these samples were obtained using a spectrophotometer. The conductivity, total dissolved solids (TDS), and total dissolved salt of the samples were measured. Nine samples of 100 ml of pure water were prepared in which eight of the samples contain addition of table salt of 1g, 3g, 4.5g, 5.5g, 15g, 20g, 25g and 28g yielding different salt concentrations (salinity). In this work, the effect of table salt in water on transmission of visible light in the range 400nm – 800nm was investigated. Sodium Chloride is one of the most abundant dissolved substances in seawater which cause attenuation of optical signals. The transmission of light underwater is affected by absorption, scattering and turbulence. Some of these advantages are high data rates, large bandwidth, and less susceptibility to electromagnetic interference.

Underwater wireless optical communication (UWOC) has advantages over other underwater communication methods.

Lifi simulation optisystem