Post on 04-Feb-2022
High Data Rate Optical Inter-Satellite Links Page 1Te
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atum
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High Data Rate Optical Inter-Satellite Links
Robert LangeTesat Spacecom
Tel: +49 7191 930 – 1267robert.lange@tesat.de
5.625 Gbps coherent optical data linkverified in-orbit
High Data Rate Optical Inter-Satellite Links Page 2Te
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atum
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Tesat - Laser Communication Terminal Performance
BER = 10-9 @ 10 Gbps, 6,000 km
0.7 W optical transmit power
@ 2 Gbps, 45,000 km
2.2 W optical transmit power
@ 1 Gbps, 72,000 km
2.2 W optical transmit power
High Data Rate Optical Inter-Satellite Links Page 3Te
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atum
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Tesat - Laser Communication Terminal Performance, cont.
Based on homodyne BPSK, coherent detection
• Highest sensitivity for communication & tracking
• Full immunity against sunlight
Link is maintained even with the counter terminal in front of the sun
Based on beacon-less acquisition
High Data Rate Optical Inter-Satellite Links Page 4Te
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atum
: 01.
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Tesat Selected Supplier for Teledesic LCTs
Teledesic: LEO network (500 LCTs)Prime: TesatProgram stopped in 1999„Risk Mitigation Phase“ successfully closed
DLR program DLR-LCT (55 M€):LEO LCT - demonstratorsPerformance verified under in-orbit conditions Prime: Tesat2001 successfully closed
In-orbit verification of an optical 5.65 Gbps ISL Page 5Te
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Laser for Homodyne BBSK
Nd:YAG NPRO, 1064.5 nm, pumped with 808 nm laser diodes
4 × 106 h MTTF
Fiber coupled
Laser linewidth ≤ 50 kHz
50 / 200 mW out of fiber
Mode-hop free tuning range ≥ 30/ 10 GHz
Tuning over > 3 bands
Fiber amplifier up to 5 W
High Data Rate Optical Inter-Satellite Links Page 6Te
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uch
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Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Spatial acquisition
Frequency acquisition
OPLL control signals
Tracking
Demodulation
Receiver for Homodyne BPSK
Local oscillator single-mode fiber
Mechanical I/F
High Data Rate Optical Inter-Satellite Links Page 7Te
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par
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Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Coarse pointer(launch locked)
Thermal I/F
Frame Unit Structurehousing
electronics,optical transmitter
Receiver
Mechanical I/F
Laser Communication Terminal
High Data Rate Optical Inter-Satellite Links Page 8Te
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Aut
hor:
Rob
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le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
NFIRE, US
TerraSAR-XGermany
Optical data link 5.625 Gbps
In-orbit Verification of Inter-Satellite Communication Link
LCT accommodated on LEO satellite TerraSAR-X (G)
LCT accommodated on LEO satellite NFIRE (USA)
High Data Rate Optical Inter-Satellite Links Page 9Te
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Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
LCTSX Laser Communication Terminal, Key Parameters
Link LEO – LEO
Data Rate 5.625 Gbps
Range 1,000 - 5,100 km
LCT Key specification
Transmit Power 0.7 W
Telescope Diameter 125 mm
High Data Rate Optical Inter-Satellite Links Page 10Te
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Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
LCTSX Laser Communication Terminal
High Data Rate Optical Inter-Satellite Links Page 11Te
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Aut
hor:
Rob
ert L
ange
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le: E
CO
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200
9 D
atum
: 01.
09.2
009
LCTSX Laser Communication Terminal, FUS
High Data Rate Optical Inter-Satellite Links Page 12Te
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Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
LCTSX Laser Communication Terminal integrated on TSX
High Data Rate Optical Inter-Satellite Links Page 13Te
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Aut
hor:
Rob
ert L
ange
Fi
le: E
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9 D
atum
: 01.
09.2
009
IOV: Links
High Data Rate Optical Inter-Satellite Links Page 14Te
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Aut
hor:
Rob
ert L
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Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Pointing, Acquisition and Tracking
Heterodyne Tracking
Phase Locking
Spatial Acquisition
Pointing
Homodyne Tracking
Communication
Frequency Acquisition
Drive LCT to expected counter LCT's direction
Align LCT to counter LCT
Follow counter LCT in a closed loopusing heterodyne control signal
Adjust local oscillator frequency to signal
Lock the phases
Follow counter LCT in a closed loopusing homodyne control signal
High Data Rate Optical Inter-Satellite Links Page 15Te
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Aut
hor:
Rob
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Fi
le: E
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200
9 D
atum
: 01.
09.2
009
Pointing, Acquisition and Tracking, cont.
Coarse AcquisitionPhase 1
M
S
Pointing
M
S
Pointing ErrorMaster Terminal
Pointing ErrorSlave Terminal
S
M
S
M
Coarse AcquisitionPhase 2
S
M
Fine Acquisition
M
...
S
High Data Rate Optical Inter-Satellite Links Page 16Te
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Aut
hor:
Rob
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Fi
le: E
CO
C/K
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200
9 D
atum
: 01.
09.2
009
IOV Performance: Pointing, Acquisition and Tracking
Link 1 Link 2
Uncertainty cones 530 µrad 745 µrad1000 µrad 1000 µrad
Spatial acquisition time 13 s 23 s
Frequency acquisition 28 s 29 s
High Data Rate Optical Inter-Satellite Links Page 17Te
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Aut
hor:
Rob
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Fi
le: E
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C/K
aBB
200
9 D
atum
: 01.
09.2
009
IOV Performance: Communication
Link 1 Link 2
Maximum possible link duration 134 s 128 s
Communication 134 s 128 s
BER < 10-9 < 10-9
High Data Rate Optical Inter-Satellite Links Page 18Te
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Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Satellite-to-Ground Link, Mobile Ground Station
High Data Rate Optical Inter-Satellite Links Page 19Te
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Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Satellite-to-Ground Link, Tracking Verification
Tracking maintained even if LCT is obscured by clouds
High Data Rate Optical Inter-Satellite Links Page 20Te
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Aut
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Rob
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Fi
le: E
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C/K
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200
9 D
atum
: 01.
09.2
009
LCTs for Optical GEO-Relays
LCT accommodated on LEO satellites TanDEM-X, Sentinel's
LCT accommodated on GEO satellites Alphabus, EDRS
High Data Rate Optical Inter-Satellite Links Page 21Te
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Aut
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9 D
atum
: 01.
09.2
009
GEO-Relay Laser Communication Terminal, Key Parameters
Link LEO – GEO, GEO – to – ground
LCT accommodated on GEO satellites Alphabus, EDRS
User Data Rate 1.8 Gbps
Range > 45,000 km
LCT Key specification
Transmit Power 2.2 W
Telescope Diameter 135 mm
High Data Rate Optical Inter-Satellite Links Page 22Te
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Aut
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9 D
atum
: 01.
09.2
009
GEO-Relay LCT Design Adaptation
Telescope diameter & transmission
TX power
High Data Rate Optical Inter-Satellite Links Page 23Te
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Aut
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Rob
ert L
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Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Coarse pointer(launch locked)
Thermal I/F
Frame Unit Structurehousing
Mechanical I/F
GEO-Relay Laser Communication Terminal
High Data Rate Optical Inter-Satellite Links Page 24Te
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Aut
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9 D
atum
: 01.
09.2
009
Satellite-to-Ground Link, Stationary Ground Station
Stationary Ground station with 400 mm telescopeAdaptive optics under developmentDesigned for operation at low altitude
High Data Rate Optical Inter-Satellite Links Page 25Te
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Aut
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9 D
atum
: 01.
09.2
009
GEO-Relay Laser Communication Terminal, Status
Manufacturing and qualification of 3 LCT FM's running
• for LEO satellites, S1a and S2a
• for GEO satellite Alphabus
LCT delivery in 2011
Optical Ground Station based on Adaptive Optics under development (funded by DLR)
OGS verification mid 2010
High Data Rate Optical Inter-Satellite Links Page 26Te
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as c
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ng a
nd p
assi
ng to
third
par
ties
Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Summary
Optical inter-satellite link verified in-orbit
NO longer a scientific specialty
BUT robust and reliable
Ready for commercial in-orbit applications
GEO relays: Sentinel, EDRS .....
High Data Rate Optical Inter-Satellite Links Page 27Te
sat-S
pace
com
Gm
bH &
Co.
KG
PRO
PRIE
TAR
Y IN
FOR
MA
TIO
N
© T
esat
-Spa
ceco
m G
mbH
& C
o.KG
rese
rves
all
right
s in
clud
ing
indu
stria
l pro
perty
righ
ts a
nd a
ll rig
hts
of d
ispo
sal s
uch
as c
opyi
ng a
nd p
assi
ng to
third
par
ties
Aut
hor:
Rob
ert L
ange
Fi
le: E
CO
C/K
aBB
200
9 D
atum
: 01.
09.2
009
Thank You For Your Attention
and
Think Coherent