Want to use the internet underwater? You can, thanks to LEDs and lasers.
— using green LEDs and a 520-nanometer laser. Both of these were used to send data from a small, simple computer to a light detector connected to another computer.
The first computer converted photos and videos into a series of 1s and 0s, which were then transferred via a light beam that turns on and off at very high speeds to transmit the signal. The light detector senses the variation in the light speed and translates it back into the computer language of 1s and 0s. This, in turn, is converted by the receiving computer into the streamed footage or other multimedia.
In the real world, Aqua-Fi would use radio waves to send data from a diver's smartphone to a"gateway" device attached to their gear. Much in the same way that a WiFi booster works, this gateway sends the data via a light beam to a computer at the surface that is connected to the internet via satellite.During their tests, the team was able to record a maximum data transfer speed of 2.11 megabytes per second and an average delay of 1.00 millisecond for a round trip.
While that is impressive, there are several obstacles the researchers still need to overcome. "We hope to improve the link quality and the transmission range with faster electronic components," explains Shihada. What's more, the light beam has to remain perfectly aligned with the receiver in moving waters, so the team is considering a spherical receiver that can capture light from all angles.
"We have created a relatively cheap and flexible way to connect underwater environments to the global internet," says Shihada."We hope that one day, Aqua-Fi will be as widely used underwater as WiFi is above water."
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