Title: Mr.

First Name: Klaus-Dieter

Last Name: Langer

Affiliation: Fraunhofer Heinrich Hertz Institute (HHI)






Research area and interests

Optical wireless communication - in the infrared and visible range - is an attractive solution, especially in environments where radio communication encounters difficulties. The Fraunhofer HHI applies modern transmission techniques that enable data-rates up to 1.25 Gbit/s (present world record) using LED-lamps, which are simultaneously used for lighting. Topics addressed in this field of R&D are to develop simple optical frontends using off-the-shelf components and standard interfaces, to achieve robust communication without transceiver alignment (no pointing and tracking), to optimize transmitters and receivers for high bandwidth, high linearity and high signal-to-noise ratios, to apply spectrally efficient modulation, and to support of multi-user communication.

Free-space optical (FSO) links (> 1 Gbit/s) over long distances have been made possible by the development of key technologies in the near infrared: high-power lasers, high-speed compo­nents, high-sensitivity detectors, cost-efficient optics. To face the current FSO challenges, HHI develops techniques to increase the link reliability and exploits its expertise on fiber-based terrestrial networks.

Research Facilities


High-speed/frequency Devices and Equipment

· High-Speed ADC/DAC, FPGA development boards (Virtex 5/6 etc.), waveform generators, IP/Protocol Tester, network analyser, oscilloscopes, spectrum analyser, various test-systems


· Optical attenuators, delay lines, dispersion compensators, dispersion test site, various receivers and receiver elements (photo diodes, photo detectors, photo receivers, light-wave converters), various laser, optical filters, EDFAs., free-space equipment, fibres


· Xilinx ISE, ModelSim, OptiSuite, BPM_CAD, OPALS, Matlab, SignalVuEssentials, MPX-SU60, BascomAVR, Labview, VPI Transmission Maker

Contact Information

Mailing Address: Einsteinufer 37, 10587 Berlin

Phone: +49 30 31002 457

Fax: +49 30 31002 250

E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Skype address: N/A





1. OPTICWISE becomes an Associate Member of the 5G PPP.


2. OPTICWISE participates in the preparation of new IEEE standart on OWC.


3. IWOW 2014 Workshop Proceedings are now available at IEEExplore! All papers can be accessed through this link.


4. OPTICWISE Chair to Give Keynote Speech at BlackSeaCom Conference.


5. IWOW 2013 Workshop Proceedings are now available at IEEExplore! All papers can be accessed through this link.

6. COST IC1101 OPTICWISE Action World Record: A FSO link at 1.6 Tbit/s (see more details on SPIE Vol 52, Issue 11, Nov 2013). 


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