Laser communication terminals based on homodyne BPSK are under in-orbit verification in LEO-to-gr... more Laser communication terminals based on homodyne BPSK are under in-orbit verification in LEO-to-ground and duplex LEO-LEO 5.65 Gbps links. With the LEO-to-ground link beacon-less acquisition has been verified as a reliable and quick acquisition procedure with acquisition times less than one minute.
Optical inter-satellite links based on homodyne BPSK modulation: heritage, status, and outlook
For a number of reasons homodyne BPSK (binary phase shift keying) is superior to all other optica... more For a number of reasons homodyne BPSK (binary phase shift keying) is superior to all other optical modulation schemes. Since BPSK has been verified as a reliable technique for space applications, laser communication terminals based on this modulation scheme are ready for in-orbit verification, which is the goal of the running LCTSX program. With this, an optical satellite-to-ground link shall be established to verify the impact the atmosphere has on a homodyne BPSK based communication link as well as the pointing and tracking performance of a laser communication terminal. In a follow-on program, an optical inter-satellite link will be established to verify the communication performance.
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2000
A space qualified single frequency laser has been presented recently. Such oscillators will be ut... more A space qualified single frequency laser has been presented recently. Such oscillators will be utilized in scientific programs as well as in commercial intersatellite communication links. One particular application is to serve as a source for LIDAR measurements (global wind fields, atmospheric dynamics). We present the development and tests of the Tesat-Spacecom seeder laser unit (SLU) used in a ESA
Space qualified laser sources
Proceedings of Spie the International Society For Optical Engineering, Apr 21, 2006
Tesat-Spacecom has developed a series of fiber coupled single frequency lasers for space applicat... more Tesat-Spacecom has developed a series of fiber coupled single frequency lasers for space applications ranging from onboard metrology for space borne FTIR spectrometers to step tunable seed lasers for LIDAR applications. The cw-seed laser developed for the ESA AEOLUS Mission shows a 3* 10 -11 Allen variance from 1 sec time intervals up to 1000 sec. Q-switched lasers with stable beam pointing under space environments are another field of development. One important aspect of a space borne laser system is a reliable fiber coupled laser diode pump source around 808nm. A dedicated development concerning chip design and packaging yielded in a 5*10 6h MTTF (mean time to failure) for the broad area emitters. Qualification and performance test results for the different laser assemblies will be presented and their application in the different space programs.
Arrangement for temperature monitoring and regulation
Optical inter-satellite links based on homodyne BPSK modulation: Heritage, status and outlook
Proceedings of SPIE - The International Society for Optical Engineering
Design study for high performance optical communications satellite terminal with high power laser diode transmitter
The present optical terminal design for a high data rate interorbit communications link with 500 ... more The present optical terminal design for a high data rate interorbit communications link with 500 Mbit/sec (or higher) transmission rate is based on high-power laser diode transmitters with 1 W peak power at 800 nm, in conjunction with a direct-detection receiver; two-channel wavelength-division multiplexing, together with the high transmission capability of the off-axis telescope used, contribute to the achievement of
Strong coupling between whispering gallery modes (WGMs) is studied in polystyrene bispheres by us... more Strong coupling between whispering gallery modes (WGMs) is studied in polystyrene bispheres by using spatially resolved spectroscopy. The supermonodispersive pairs of spheres (size deviation <0.03%) were selected using their uncoupled WGM peaks' positions. By using novel geometries of capturing light by the imaging spectrometer we observed clear spectral signatures of strong coupling between WGMs for bispheres with mean sizes from 2.9 to 10 μm.
This paper describes the design and performance of the TESAT Reference Laser Head, acting as the ... more This paper describes the design and performance of the TESAT Reference Laser Head, acting as the frequency reference for the ALADIN Transmit Assembly (TXA) for the ESA AEOLUS satellite. First measurements of short time frequency stability (130 kHz rms over 360 sec) and digitally controlled coarse and fine step tuning functionality will be presented.
<title>Design study for high-performance optical communications satellite terminal with high-power laser diode transmitter</title>
Optical Space Communication II, 1991
<title>Optical inter-satellite links based on homodyne BPSK modulation: heritage, status, and outlook</title>
Free-Space Laser Communication Technologies XVII, 2005
ABSTRACT
<title>142 km, 5.625 Gbps free-space optical link based on homodyne BPSK modulation</title>
Free-Space Laser Communication Technologies XVIII, 2006
ABSTRACT A free-space optical link based on homodyne BPSK (binary phase shift keying) has been es... more ABSTRACT A free-space optical link based on homodyne BPSK (binary phase shift keying) has been established between two of the Canary islands, La Palma and Tenerife, to transmit 5.625 Gpbs across 142 km. This link verifies homodyne BPSK as a robust modulation scheme even for the transmission through the atmosphere.
Tesat-Spacecom has developed a series of fiber coupled single frequency lasers for space applicat... more Tesat-Spacecom has developed a series of fiber coupled single frequency lasers for space applications ranging from onboard metrology for space borne FTIR spectrometers to step tunable seed lasers for LIDAR applications. The cw-seed laser developed for the ESA AEOLUS Mission shows a 3* 10-11 Allen variance from 1 sec time intervals up to 1000 sec. Q-switched lasers with stable beam
Highly-coherent optical terminal design status and outlook
Digest of the LEOS Summer Topical Meetings, 2005., 2005
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Papers by Berry Smutny