Communications
CubeSat33 uses a compact optical terminal with active beam steering to move large data volumes during each clear pass — paired with radio for commands and weather-blocked windows.
Approach
RF CubeSat links are reliable but bandwidth-limited. Optical links reverse that: higher rate, narrower beam, and tighter pointing requirements. Beam steering closes the gap.
A fine steerer compensates residual body-pointing error and jitter so the narrow laser beam stays locked on the ground station.
Housekeeping, commands, and low-rate telemetry continue on radio when clouds, geometry, or safety rules block the laser.
Optical links are weather-sensitive. The architecture plans for partial availability instead of pretending every pass is clear.
Why laser
Without laser
A few minutes of contact at modest RF rates returns limited volume. Operators store data for later — sometimes for many orbits — and science value ages in memory.
With laser + dwell
Dual-mode propulsion improves when and where the satellite can look. Laser throughput improves how much returns during each open window. Together they attack the wasted-time problem from both sides.
Practical design notes
CubeSat-scale terminal
Optical modules in the ~1U class with multi-hundred Mbps to Gbps-class raw modes when link conditions allow.
Relaxed but not zero ADCS
Built-in compensation helps, but the host still needs stable attitude knowledge and control within published host constraints.
Ground segment reality
Optical ground stations are fewer than RF sites. Mission planning must schedule high-priority dumps against real station availability.
No mega-network dependency
Earlier Starlink-style relay concepts required operator cooperation that does not exist. Direct laser + RF is the controllable path.