laser communication for edrs - ccsds.org completed (closed wgs)/optica… · laser communication...
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PIONEERING WITH PASSION
©Tesat-Spacecom GmbH & Co.KG 2010
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PIONEERING WITH PASSION
PROPRIETARY INFORMATION
©Tesat-Spacecom GmbH & Co.KG reserves all rights including industrial property rights,
and all rights of disposal such as copying and passing to third parties
LASER COMMUNICATION FOR EDRS
LEO-GEO, LEO-GROUND, GEO-GROUND
Robert Lange (Tesat-Spacecom)
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PIONEERING WITH PASSION
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TESAT LCT Ready for Commercial Operation
17.04.2012 Laser Products, Dr. Robert Lange 2
Figure courtesy of ESA _ P. Carril Figure courtesy of ESA _ P. Carril
Applied in EDRS
Increased availability
12 h per day
instead of
several minutes
Increased data rate
Up to 10 Gbps
1.8 Gbps for EDRS
Figure courtesy of ESA_P. Carril
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EDRS LCTs Based on Links Verified In-Orbit !
17.04.2012 Laser Products, Dr. Robert Lange 3
NFIRE TerraSAR-X Optical inter-satellite links
Inter-satellite links Space-to-ground links Ground-to-space links at data rates of 5.625 Gbps
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Most sensitive
Highly immune
against sun light
Homodyne BPSK maintains the optical link
even with the sun in the Field Of View !
LCT: Based on Homdyne BPSK
17.04.2012 Laser Products, Dr. Robert Lange 4
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Designed for lowest fit rate
by laser diode redundancy
• Hot: Laser diode bench
• Cold: Redundant benches
Pump Module Reliability
> 0.999 in 15 years
Homodyne BPSK: Reliable
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Nd:YAG laser
Frequency stability ensured by MISER principle
Polarization maintaining mono-mode fiber coupled
Homodyne BPSK: Robust
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Homodyne BPSK: Easy Handling
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Easy handling interface
Receiver Front End performing • Spatial acquisition • Frequency acquisition • OPLL control signals • Tracking • Demodulation
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LCT operational in-orbit
Verified as reliable and robust
Extensive test and measurement campaigns
have proven calculated link budgets to be very accurate
FM lasers delivered to ESA and US aero-space industry
Heritage:
GIFTS, ALADIN, LISA, ATLID, several classified programs ...
Homodyne BPSK: Technology Readiness Level 9
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Laser Communication Terminal: In-Orbit Verification
17.04.2012 Laser Products, Dr. Robert Lange 9
LEO – LEO Links
Data Rate 5.625 Gbps
Range Up to 5,100 km
Target Bit Error Rate 10-8
Transmit Power 0.7 W
Telescope Diameter 125 mm
Mass 35 kg
Power Consumption ~ 120 W max.
Envelope ~ 0.5 x 0.5 x 0.6 m3
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In-Orbit Verification: LCT Accommodated on TerraSAR
17.04.2012 Laser Products, Dr. Robert Lange 10
LCT integrated on TerraSAR-X (LEO satellite) Launched June 14th 2007 Status: LCT fully operational
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In-Orbit Verification: LCT Accommodated on NFIRE
17.04.2012 Laser Products, Dr. Robert Lange 11
LCT integrated on NFIRE (U.S. LEO satellite) Launched April 23rd 2007 Status: LCT fully operational
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In-Orbit Verification: First ISL dated Feb. 21st 2008
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TerraSAR-X
NFIRE
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In-Orbit Verification: Inter-Satellite Link
17.04.2012 Laser Products, Dr. Robert Lange 13
Bit errors measured in one of the 25 data channels of 225 Mbps
Only one bit error measured for one of the LCTs within 400 s
Bit error rate better than 10-11
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In-Orbit Verification: Ground Station
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In-Orbit Verification: Space-to-Ground Link
17.04.2012 Laser Products, Dr. Robert Lange 15
Bit error rate still low, but increased due to atmospheric distortion
Measurement campaign running to optimize communication link by
use of adaptive optics
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In-Orbit Verification: Ground-to-Space Link
17.04.2012 Laser Products, Dr. Robert Lange 16
First link (not yet optimized !) already verifies feasibility of uplink
Communication at amazing low bit error rates of 10-5
Bit error rate increase due to atmospheric disturbance
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Laser Communication Terminal: Optical GEO Relay
17.04.2012 Laser Products, Dr. Robert Lange 17
LEO – GEO – GEO Links
Data Rate 1.8 Gbps
Range Up to 45,000 km
Target Bit Error Rate 10-8
Transmit Power 2.2 W
Telescope Diameter 135 mm
Mass 50 kg
Power Consumption ~ 160 W max.
Envelope ~ 0.6 x 0.6 x 0.7 m3
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The Optical GEO Relay as Used for Alphasat
17.04.2012 Laser Products, Dr. Robert Lange 18
NFIRE TerraSAR-X Optical inter-satellite links
Inter-satellite links Space-to-ground links Ground-to-space links at data rates of 5.625 Gbps
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LCT: GEO-LCT for Alphasat
17.04.2012 Laser Products, Dr. Robert Lange 19
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Alphasat LCT, the GEO Relay Demonstrator
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NFIRE TerraSAR-X
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GEO-to-Ground Links at 1.8 Gbps and more….
17.04.2012 Laser Products, Dr. Robert Lange 21
Data rate increased by large telescope diameter (40 cm)
Requires adaptive optics
Deformable mirror
(12 x 12 elements, element size 0.45mm x 0.45mm)
Verified under worst case conditions with a coherent beam running horizontally across more than 20 km through the atmosphere, 1 m RX aperture
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Laser Communication Terminals for …
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… Alphasat (GEO)
… Sentinal 1-a (LEO)
… Sentinal 2-a (LEO)
… EDRS-A (GEO)
… EDRS-C (GEO)
… Framce Contract with ESA
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Summary
17.04.2012 Laser Products, Dr. Robert Lange 23
Laser Communication
based on homodyne BPSK
ready for
commercial operation
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PIONEERING WITH PASSION
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Tesat-Spacecom
Gerberstraße 49
71522 Backnang
For further information please contact:
Thank you very much for your attention !
Dr. Robert Lange
+49 7191 930 1267
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The LCT development and the in-orbit verification is supported by the German Space Agency DLR/BMWi under 50YH0202 and 50YH063