Laser Communications

10-100x faster than radio

Radio waves carried us to the Moon and Mars. Lasers will carry us to the next era. NASA just proved 267 Mbps via laser from beyond Mars distance - and that's just the beginning.

LEO Record

200 Gbps

TBIRD, 2022

Lunar Record

622 Mbps

LLCD, 2013

Deep Space

267 Mbps

DSOC close range, 2025

Commercial

1.8 Gbps

ESA EDRS, operational

Radio vs Laser: Head to Head

Laser isn't always better - each has strengths. Future missions will use both.

Property Radio (RF) Laser (Optical)
Data rate Up to 6 Mbps from Mars Up to 267 Mbps from Mars distance
Improvement Baseline 10-100x faster at same distance
Beam width Wide (easier to point) Extremely narrow (harder to point)
Pointing accuracy Moderate Like hitting a dime from 10 km
Weather impact Minimal Clouds block the beam
Power efficiency Lower Much higher per bit
Size & weight Large antennas needed Smaller, lighter terminals
Multi-receiver Yes (broadcast) No (point-to-point only)
Best for Commands, backup, initial contact High-bandwidth data downlink
Maturity 60+ years operational Demonstrated, entering operations

Every Major Laser Demo Compared

From the first lunar laser link to commercial operations - the optical revolution in numbers.

System Agency Year Speed Distance Status
TBIRDNASA/MIT2022200 GbpsLEORecord
EDRSESA/Airbus2016-now1.8 GbpsGEO-LEOCommercial
LCRD + ILLUMA-TNASA2023-now1.244 GbpsISS to GEOActive
LLCDNASA2013622 MbpsLunar orbitCompleted
DSOCNASA/JPL2023-2025267 Mbps peak460M kmDistance record
Artemis II O2ONASAApril 2026260 MbpsLunar distanceUpcoming

The Starlink connection

Starlink's 10,000+ satellites communicate with each other using laser inter-satellite links - transmitting 42 petabytes per day via infrared lasers. While the technology isn't directly interoperable with NASA's DSOC/LCRD systems (different wavelengths and protocols), it's the same fundamental approach: replacing radio with light. Starlink has built the world's largest operational space optical network, and SpaceX's experience will inform their proposed MarsLink constellation.

Related

Space Protocols

DTN and Bundle Protocol - the software layer

Lunar Internet

LLCD proved 622 Mbps laser from the Moon

ISS Internet

ILLUMA-T: 1.2 Gbps laser on the station

Frequently Asked Questions

How does laser communication work in space?
Instead of radio waves, laser (optical) communication uses near-infrared light to transmit data. A laser beam is pointed precisely at a receiving telescope. Because the beam is much narrower than radio, it delivers far more energy to the detector, enabling 10-100x higher data rates at the same power. The downside: you need incredibly precise pointing (hitting a dime from 10 km away) and weather can block the signal at ground stations.
How fast is laser communication from space?
The fastest space laser link is NASA's TBIRD at 200 Gbps from low Earth orbit (2022). From the Moon, NASA's LLCD achieved 622 Mbps (2013). From deep space (beyond Mars distance), DSOC achieved 267 Mbps at close range and 6.25 Mbps at 2.7 AU (2025). The ISS ILLUMA-T terminal achieves 1.2 Gbps. ESA's EDRS operates commercially at 1.8 Gbps.
Will laser replace radio for space communication?
Partially. Laser is 10-100x faster but has limitations: it requires clear weather at ground stations (clouds block the beam), needs extremely precise pointing, and can't broadcast to multiple receivers. Radio remains better for initial spacecraft contact, emergency communications, and surface-to-orbit links. Most future missions will use both: laser for high-bandwidth data downlink, radio for commands and backup.
What is DSOC?
Deep Space Optical Communications (DSOC) is a NASA technology demonstration that launched on the Psyche spacecraft in October 2023. It proved laser communication works at interplanetary distances - achieving 267 Mbps at close range and maintaining links up to 460 million km (beyond Mars distance). DSOC completed all 65 planned test sessions with 100% success by September 2025, transmitting 13.6 terabits total.

Sources

  1. NASA - Deep Space Optical Communications (DSOC) - accessed 2026-03-25
  2. NASA - ILLUMA-T Laser Terminal on ISS - accessed 2026-03-25
  3. NASA - Laser Communications Relay Demonstration (LCRD) - accessed 2026-03-25
  4. MIT Lincoln Lab - TBIRD 200 Gbps Demo - accessed 2026-03-25
  5. ESA - EDRS SpaceDataHighway - accessed 2026-03-25
  6. NASA LLCD - 622 Mbps from the Moon (2013) - accessed 2026-03-25
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