Taiyo Yuden Co Ltd and Toyo Electric Corp co-developed a device that enables high-speed wireless data transmission under water by using visible light.
With a general-purpose LED device that emits blue light, whose attenuation rate is low under water, the companies realized an underwater transmission rate of up to 50Mbps.
In general, the attenuation rate of radio wave becomes very high under water, making it difficult to realize radio wave-based wireless transmission. Therefore, though there are low-speed wireless transmission technologies using sound waves or visible light, there has been no high-speed data transmission method that allows to transmit a large amount of data such as video data.
Taiyo Yuden and Toyo Electric have been testing the device in a swimming pool in collaboration with NHK (Japan Broadcasting Corp). And they plan to reduce the size and weight of the device and develop various applications.