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The Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut (HHI) belongs to the Fraunhofer-Gesellschaft, an autonomous non-profit R&D organization, currently maintaining 59 different R&D institutes throughout Germany. HHI has 230 employees and about 60 student research assistants. The core competencies are in the areas of photonic networks and components (nearly 50% of the staff), mobile broadband systems, and electronic imaging technology for multimedia. Along with this expertise, a full range of design, technology, measurement, and experimental capabilities exists for photonic networks, systems and devices. HHI is a valued partner in national and international co-operative R&D projects, where most of the work is carried out in close partnership with industry and universities. Research and development (R&D) activities of the department ‘Photonic Networks and Systems‘ aim to advance optical networking technologies that are needed to realise the physical layer of the future Broadband Internet. The primary goal of the department is to obtain a better utilization of the fiber-optic infrastructure as well as to increase the performance of optical networks by means of novel system concepts and transmission schemes. The groups are primarily interested in designing high speed and high capacity ultra long haul optical transmission systems. Their current work covers upgrade studies of submarine systems and terrestrial core and metro systems for bitrates up to 100 Gbit/s per wavelength. Further research topics of these groups are coherent detection in combination with electronic distortion equalization and digital phase estimation as well as transmitter sided electronic pre-distortion. Other areas of expertise include the design of high speed local area and campus networks as well as fibre-to-the-home systems. The department photonic networks and systems has 40 Gbit/s re-circulating DWDM loop testbeds, 2.5 Gbit/s based CWDM testbed and a 2.5 Tbit/s OTDM testbed. The groups have been involved in a variety of national (e.g. MultiTeraNet, Eibone) and international (MUSE, Nobel, e-PHOTON/ONe, FUNFOX) research projects.

Personnel involved in EURO-FOS

Dr. Ronald Freund received the Dipl.-Ing. degree and the Dr.-Ing. degree ”On Computer Aided Modelling of Photonic Systems and Networks” in electrical engineering from Technical University of Ilmenau (TUI), in 1993 and in 2002, respectively. From 1993 to 1995 he worked as a research fellow at TUI. In 1997 he co-founded VPI Systems Inc., formally Broadband Network Design GmbH, where he was involved in as Chief Technology Officer and Consultant, responsible for the development of design software for the physical layer of optical networks and national and international research assignment with, e.g., Sprint, AT&T, Luxcore, and the European Union (e.g., ACTS-Demon, etc.). Since 1995 he is with Heinrich-Hertz-Institut in Berlin, where he is currently working as a group leader with the focus on the design of next generation WDM systems. Dr. Freund has authored and co-authored more than 50 scientific publications.

Dr. Colja Schubert was born in Berlin, Germany, in 1973. He received the Dipl.-Phys. and Dr. rer. nat. degrees in physics from the Technische Universität Berlin, Germany, in 1998 and 2004, respectively. From 1996-97 he was exchange student at the Strathclyde University in Glasgow, United Kingdom. During his diploma thesis 1997-98, he worked at the Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany. Since 2000 he is a member of the scientific staff at the Heinrich-Hertz-Institute (HHI) Berlin. He has been doing research work in the field of high-speed optical transmission systems. He was in particular involved in all-optical signal processing for high data rates, which was also the topic of his PhD thesis. He authored and co-authored more than 70 scientific papers in the field of optical communications. Dr. Schubert is a member of the German Physical Society.

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