Dr. Karl-Otto Velthaus Profile

Dr. Karl-Otto Velthaus

at Fraunhofer-HHI

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 4 March 2019 Presentation + Paper

A new generation of high-speed electro-optical transceivers and flexible bandwidth wavelength selective switches for coherent DCI: the QAMeleon project approach

C. Zervos, M. Spyropoulou, I. Kanakis, I. Lazarou, K.-O. Velthaus, E. Rouvalis, G. Torfs, E. Goobar, R. Santos, N. Tessema, T. Lamprecht, T. Johansen, R. Hersent, H. Mardoyan, S. Dris, T. Alexoudi, P. Giardina, D. Roccato, G. Vickers, H. Avramopoulos

Proceedings Volume 10924, 109240E (2019) https://doi.org/10.1117/12.2509454

KEYWORDS: Waveguides, Digital signal processing, Polarization, Photonic integrated circuits, Photonics, Liquid crystal on silicon, Polymers, Switches, Transceivers, Modulation

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Proceedings Article | 25 January 2011 Open Access

Higher-order modulation formats for spectral-efficient high-speed metro systems

R. Freund, M. Nölle, M. Seimetz, J. Hilt, J. Fischer, R. Ludwig, C. Schubert, H.-G. Bach, K.-O. Velthaus, M. Schell

Proceedings Volume 7959, 795902 (2011) https://doi.org/10.1117/12.881243

KEYWORDS: Receivers, Modulation, Phase shift keying, Transmitters, Modulators, Polarization, Tolerancing, Quadrature amplitude modulation, Digital signal processing, Field programmable gate arrays

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Proceedings Article | 30 September 2005 Paper

Recent developments in InP-based optoelectronic devices

H. Venghaus, H.-G. Bach, S. Bauer, A. Beling, H. Heidrich, D. Hoffman, B. Hüttl, R. Kaiser, J. Kreissl, G. Mekonnen, M. Möhrle, W. Rehbein, B. Sartorius, K.-O. Velthaus

Proceedings Volume 5956, 59560I (2005) https://doi.org/10.1117/12.626559

KEYWORDS: Waveguides, Modulation, Photodetectors, Photodiodes, Eye, Semiconductor lasers, Laser applications, Mode locking, Optoelectronic devices, Modulators

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Proceedings Article | 9 December 1992 Paper

Chalcopyrite semiconductors for highly efficient thin-film solar cells

Thomas Walter, R. Klenk, M. Ruckh, K. Velthaus, Hans Schock

Proceedings Volume 1729, (1992) https://doi.org/10.1117/12.130571

KEYWORDS: Copper, Thin films, Gallium, Solar cells, Sulfur, Heterojunctions, Silver, Copper indium disulfide, Thin film solar cells, Chalcopyrites

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