Effects of oceanic channels degrade the performance of underwater optical communication (UOC) systems based onorbital angular momentum (OAM) multiplexing. Considering both oceanic turbulence and water attenuation, a morecomprehensive channel model is proposed. We derive the expressions of bit error rate (BER) and aggregate capacity ofUOC-OAM systems. We also investigate the system performance with wavelengths of 400-700 nm . The numericalsimulation results show that the blue-green wavelength is not always the best choice to provide large channel capacitiesfor UOC-OAM systems. For large chlorophyll-a concentration channel, due to the strong attenuation the optimalwavelength is shifted toward red wavelength region. Meanwhile, with increasing of oceanic turbulence strength, thefrequency bandwidth decreases and systems with larger wavelength show better performance. These results will bebeneficial to the design and application of UOC-OAM systems.
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