Technical analysis and engineering reference.
Unlike terrestrial glass fibers which suffer from chromatic dispersion, polarization mode dispersion, and non-linear Kerr phase shifts, the hard vacuum of space is an ideal transmission medium: zero non-linear self-phase modulation, zero Raman scattering, and light traveling at the true speed of light (300,000 km/s vs. 200,000 km/s in glass).
Because optical beams naturally diverge over 5,000 to 10,000 km inter-satellite spans, received power is minuscule: - Erbium-Doped Fiber Amplifiers (EDFA) boost transmit power to +33 dBm across 32 simultaneous DWDM wavelengths. - Receiver apertures utilize coherent digital signal processing (DSP) to recover phase and frequency symbols down to photon-starved limits (-45 dBm sensitivity). - Fine Steering Mirrors (FSM) utilizing piezoelectric actuators cancel spacecraft micro-vibrations, maintaining sub-micro-radian alignment.
Deploying 1.6 Tbps orbital trunks gives landlocked nations and island archipelagos access to sovereign, high-speed international transit independent of foreign undersea cable landings.