DSOC uses which form of transmission for deep-space data?

DSOC uses which form of transmission for deep-space data?

• A. Radio frequency
• B. Microwave
• C. Infrared
• D. Optical

Answer: (D)

Optical transmission means sending data with laser light. DSOC, the Deep Space Optical Communications demonstration, uses a laser link to transmit data from deep space to Earth. The big advantage is bandwidth: light carries far more information per second than radio waves, so a laser link can achieve much higher data rates over the same distance and with similar power. The laser beam is also highly directional, so it spreads very little as it travels, which means more photons arrive at the ground receiver and the link can be efficient even across interplanetary distances. Of course, this requires very precise pointing from both the spacecraft and the ground station, and Earth's atmosphere can affect the signal, needing adaptive optics and clear-sky windows. Infrared is part of the optical spectrum, and DSOC uses near-infrared laser wavelengths, but the overall category used to describe this technology is optical communications.

Optical transmission means sending data with laser light. DSOC, the Deep Space Optical Communications demonstration, uses a laser link to transmit data from deep space to Earth. The big advantage is bandwidth: light carries far more information per second than radio waves, so a laser link can achieve much higher data rates over the same distance and with similar power. The laser beam is also highly directional, so it spreads very little as it travels, which means more photons arrive at the ground receiver and the link can be efficient even across interplanetary distances. Of course, this requires very precise pointing from both the spacecraft and the ground station, and Earth's atmosphere can affect the signal, needing adaptive optics and clear-sky windows. Infrared is part of the optical spectrum, and DSOC uses near-infrared laser wavelengths, but the overall category used to describe this technology is optical communications.