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The Tesat LCT135 is a laser communication terminal for transmission up to 80,000km; GEO to GEO, GEO to LEO, GEO to Airborne, GEO to Ground.


  • Gigabit Inter-Satellite Link (ISL) for Data Relay on GEO
  • Core element of the operational service for the European Data Relay Satellite System (EDRS)
  • 14 flight models delivered/in production

Key features

  • Space qualified coherent 1064nm laser source
  • Homodyne BPSK modulation
  • Designed for long range, high data rate transmissions with resiliency to sunlight and jamming.
  • 2Mbps forward channel (tasking); 3.6Gbps data rate increase; dual wavelength(1064nm + 1550nm) for interoperability options

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Last updated: 2023-01-30

LCT 135 - GEO Satellite Laser Communication Terminal



53 kg
60 cm
60 cm
70 cm
power consumption
max. 150W in acquisition mode,
120W in communication mode
transmit power
2.2 W
data rate
1.8Gbps, bidirectional
15 years in GEO orbit


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