Tune the PID loop that steers MEMS mirrors, then stress the photon path with temperature ramps and dust pulses. Watch the alignment error, link BER, and power draw respond as you fight to keep the beam inside a ±5 µm window.
Grey halo indicates the acceptable ±5 µm tolerance band on the receiver. Beam drift is simulated using Gaussian noise, thermal expansion, and control loop output.
Thermal drift increases 0.12 µm/°C relative to baseline.