2×1.7-Terabit/s eye-safe optical link demonstrated over 380 meters at Fraunhofer HHI
2x1.7-Terabit/s eye-safe optical link demonstrated over 380 meters at Fraunhofer HHI © Google Streetview
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).
https://www.hhi.fraunhofer.de/en/press-media/press-releases.html
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