
sat-S

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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


@ 1 Gbps, 72,000 km



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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


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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 Te

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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


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Spatial acquisition

Frequency acquisition

OPLL control signals

Tracking

Demodulation

Receiver for Homodyne BPSK

Local oscillator single-mode fiber

Mechanical I/F


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Coarse pointer(launch locked)

Thermal I/F

Frame Unit Structurehousing

electronics,optical transmitter

Receiver

Mechanical I/F

Laser Communication Terminal


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: 01.

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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)


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: 01.

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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


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LCTSX Laser Communication Terminal


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LCTSX Laser Communication Terminal, FUS


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: 01.

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LCTSX Laser Communication Terminal integrated on TSX


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: 01.

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IOV: Links


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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


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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


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: 01.

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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


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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


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Satellite-to-Ground Link, Mobile Ground Station


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Satellite-to-Ground Link, Tracking Verification

Tracking maintained even if LCT is obscured by clouds


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LCTs for Optical GEO-Relays

LCT accommodated on LEO satellites TanDEM-X, Sentinel's

LCT accommodated on GEO satellites Alphabus, EDRS


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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


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GEO-Relay LCT Design Adaptation

Telescope diameter & transmission

TX power


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Coarse pointer(launch locked)

Thermal I/F

Frame Unit Structurehousing

Mechanical I/F

GEO-Relay Laser Communication Terminal


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Satellite-to-Ground Link, Stationary Ground Station

Stationary Ground station with 400 mm telescopeAdaptive optics under developmentDesigned for operation at low altitude


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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


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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 .....


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Thank You For Your Attention

and

Think Coherent

high data rate optical inter-satellite links

Documents