A bidirectional 1.7-Tbit/s free-space optical communications link has been set up between two buildings of the Fraunhofer Heinrich Hertz Institute HHI in Berlin. Eye-safe operation through 380-m air was successfully demonstrated at a total antenna output power of less than 10 mW. The signals in both directions consisted of 40 wavelength channels of 43 Gbit/s.
The measured bit-error rate of the channels fluctuated between 1E-8 and 0 without forward error correction.
The two bidirectional terminals were placed in the same building whereas a relay mirror was placed in the other building to increase the link distance.
Fine and coarse tracking systems stabilized the coupling into the single-mode fibers at both terminals.
This result was achieved with the support of Huawei Technologies. To increase the link distance to several kilometers, additional techniques, on which the Fraunhofer HHI is currently working, will be integrated to the terminals to mitigate optical turbulence effects.
Applications of interest are high-speed free-space Internet connects in converged city and access networks.
The fiber-based system that generates and demodulates the 1.7-Tbit/s signal was also successfully deployed over a free-space unidirectional 10-km link with the high-power free-space transmission system of the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR).
Anne Rommel | Fraunhofer-Institut für Nachrichtentechnik Heinrich-Hertz-Institut
TIB’s Visual Analytics Research Group to develop methods for person detection and visualisation
19.03.2018 | Technische Informationsbibliothek (TIB)
Green Light for Galaxy Europe
15.03.2018 | Albert-Ludwigs-Universität Freiburg im Breisgau
For the first time, an interdisciplinary team from the University of Basel has succeeded in integrating artificial organelles into the cells of live zebrafish embryos. This innovative approach using artificial organelles as cellular implants offers new potential in treating a range of diseases, as the authors report in an article published in Nature Communications.
In the cells of higher organisms, organelles such as the nucleus or mitochondria perform a range of complex functions necessary for life. In the networks of...
Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...
On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...
The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...
At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.
When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...
19.03.2018 | Event News
16.03.2018 | Event News
13.03.2018 | Event News
19.03.2018 | Physics and Astronomy
19.03.2018 | Materials Sciences
19.03.2018 | Event News