Comment Re:Only 2.5Gbps? (Score 1) 32
This seems slow. Current radio technology exceeds that by 1 to 2 orders of magnitude. Plus, lasers tend to have problems with cloud cover.
What am I missing?
One can get multi-Gpbs radio links from orbit, but it tends to be 1) physically large and heavy, and 2) quite power hungry. These demonstrators are 6U cubesats, meaning the optical link equipment is really compact and power efficient.
For comparison: the NASA TDRS network, used for providing feeds from the ISS and telemetry from a bunch of LEO satellites, can manage 0.8 Gbps in the Ku-band. But those satellites are house-sized and use >1kW. NASA has been doing experiments and demo missions to use optical links for higher bandwidth.
Another comparison: Starlink satellites have a couple kW of electrical power available, and each one can do a few Gbps on its radio downlink. But it uses optical links to achieve up to 200 Gbps between satellites for backhaul.