Hydromea, affiliated with the FederalPolytechnic School of Lausanne (EPFL), has created a compact optical modem capable of operating at depths of up to 6,000 meters from the ocean surface. The device, called LUMA, has a sensitivity that allows it to transmit data at a very high speed from sources located at a distance of 50 to 100 meters.
The principle of operation of "underwater Wi-Fi" is identicalLi-Fi technology (wireless data transmission using visible light). The transmitter encodes the digital data into the flicker of the light source, and the photosensitive receiver receives the optical signal. The difference in technology lies in the use of light with different wavelengths. So for data transmission over the air, white, yellow and infrared light are used, while for "underwater Wi-Fi" green or blue light is used.
The system has been tested in the Pacificat a depth of 4280 meters below sea level by scientists from the Institute for Polar and Marine Research Alfred Wegener from Germany. LUMA equipment is housed in a robust plastic housing that protects against high pressure. The plastic is transparent and allows you to transmit a light signal over a distance of 50 to 100 meters.
New technology does not allow broadcastingdata from deep-sea instruments to the surface. However, to take readings under water, robots can be sent, which, when approaching equipment equipped with LUMA at 50-100 meters, will be able to receive data. This design eliminates the need to retrieve various sensors and instrumentation from depth each time.