The High-Throughput Optical Systems Group deals with research in the area of high-speed optical satellite links interfaces. This includes topics ranging from the study of the atmospheric turbulence and the techniques to counteract its effects to the development of high-speed communications technologies and systems. In the focus of the group lies experimental validation of the theoretical models.
Industry 4.0 and Internet of Things are two aspects of the upcoming new era of digitalization requiring global connectivity; i.e. globally available broadband internet access. As few as three geostationary satellites can provide global coverage, solving the limitation of the ground infrastructure availability. The use of optical technologies for the connection between the satellite and the ground network (feeder-link) solves the radiofrequency bottleneck: optical frequencies are highly power efficient and offer available (unregulated) spectrum in the order of THz.
The characterization of atmospheric turbulence inclduing theoretical analysis, simulation and experimental characterization is a central research topic in the group.
Adaptive optics is used in astronomy to compensate for the phase-distortions introduced by the atmosphere. Communications scenarios are more challenging in terms of turbulence strength and required bandwidth. The main goal is to reach stable and efficient coupling into a single-mode fiber, in order to integrate fiber-based optical components, like, for example, pre-amplifiers or demultiplexers at the receiver.
The research is focused on:
Laser guide stars technology is commonly used in astronomy to provide a reference for the adaptive optics in the desired direction. The estimation of the tip/tilt is still under research and the first experiments have been done in collaboration with ESO (European Southern Observatory)  and currently also with Durham University, INAF (Istituto Nazionale di Astrofisica) and ESA.
 DLR, World record in free-space optical communications, press-release
 Poliak, J.; Mata Calvo, R.; & Rein, F., Demonstration of 1.72 Tbit/s optical data transmission under worst-case turbulence conditions for ground-to-geostationary satellite communications, IEEE COMMUNICATIONS LETTERS, VOL. 22, NO. 9, 1818-1821, 2018
 DLR, DLR and ADVA set a new world record in optical free-space data transmission, press-release
 Mata Calvo, R.; Becker, P.; Giggenbach, D.; Moll, F.; Schwarzer, M.; Hinz, M. & Sodnik, Z., Transmitter diversity verification on ARTEMIS geostationary satellite, Proc. SPIE, 2014, 8971, 897104-897104-14
 Carrizo, C. E.; Mata Calvo, R. & Belmonte, A., Intensity-based adaptive optics with sequential optimization for laser communications, Opt. Express, OSA, 2018, 26, 16044-16053
 Mata Calvo, R.; Bonaccini Calia, D.; Barrios, R.; Centrone, M.; Giggenbach, D.; Lombardi, G.; Becker, P. & Zayer, I., Laser guide stars for optical free-space communications, Proc.SPIE, 2017, 10096, 10096 - 10096 – 12
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