To ensure good broadband quality to earth stations, the Starlink constellation uses laser connections between satellites. The laser creates a mesh, optimizing high-speed data transmission.
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[EN VIDÉO] How to put a satellite into orbit around the Earth? Without us even being aware of it, satellites have become essential to our daily lives….
Forty-two petabytes is what the network transmits every day. constellationconstellation thousands of Starlink satellites. While satellite internet could previously be quite slow and lacked stability, SpaceXSpaceX demonstrated that it was possible to provide high-performance very high bandwidth anywhere on Earth. These satellite stations also allow Ukrainian forces to remain connected on the battlefield, even though all communications equipment has been destroyed. These 42 petabytes per day are the equivalent of 28 million hours of FullHD video.
For transmissions to terrestrial relays, satellites use radio frequencies on the KU (television) and KA (satellite broadband) bands. For the KA frequency, the wave lengthwave length corresponds to the part of spectrespectre frequencies between 26.5 and 40 GHz. But these frequencies are disrupted by weather conditions or other frequencies, which explains why the speeds are not always guaranteed and the connection is often unstable.
A laser mesh between satellites
So, to optimize these speeds and considerably reduce latency, this is happening in space. In 2021, during its launch campaignslaunch campaignsSpaceX added communication systems by laserlaser to satellites. These lasers make it possible to create an ultra-fast network between satellites. In total, this represents a mesh of 9,000 laser beams which transmit 5.6 terabits of data per second every day.
This network allows a satellite to deliver data at very high speed to another which is better positioned for transmission to the terrestrial relay. If it is in space that this data circulates quickly, with this mesh between satellites the transmission to terrestrial relays remains classic, but much faster and with little latency. To optimize throughput, laser connections between satellites are constantly repositioned. There would be 266,141 every day. But some connections can last several weeks when they are successful.
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