Zobrazeno 1 - 10
of 57
pro vyhledávání: '"S. Ummethala"'
Autor:
Venkata Anirudh Pammi, Lothar Hahn, Christian Koos, Ahsan H. M. Uddin, S. Ummethala, Wolfgang Freude
Publikováno v:
Conference on Lasers and Electro-Optics
We demonstrate horizontal-slot plasmonic-organic hybrid (HS-POH) modulators and show that the n-voltage-loss product aUL is by 25 % better than for conventional vertical-slot devices. The slot is realized by a sacrificial layer, thereby relaxing extr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::628751a2de8e3ebb2b27cfff5e033045
Publikováno v:
Journal of the Optical Society of America B. 38:3743
Microring resonators are one of the most sought-after optical components for realizing several on-chip functionalities that include sensing, data routing, new frequency generation, and quantum photonic applications. Many of these applications demand
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee097796f73d69c2e025ef7e40cc9e48
https://doi.org/10.1364/josab.430789
https://doi.org/10.1364/josab.430789
Autor:
S. Ummethala, Lothar Hahn, Christian Koos, S. Muehlbrandt, Wolfgang Freude, Sebastian Randel, Simon Nellen, T. Harter
Publikováno v:
2019 21st International Conference on Transparent Optical Networks (ICTON)
ICTON
ICTON
Silicon-plasmonic internal photoemission devices can act as photomixers for generating terahertz frequency carriers (T-waves) for transmitters (Tx), or they function as receivers (Rx) for coherently downconverting T-wave signals to the baseband. In a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::afad22cb59b7718b39266d97fca0ef27
Autor:
Axel Tessmann, Pablo Marin-Palomo, Wolfgang Freude, Thomas Zwick, Suresh Kumar Garlapati, Christian Koos, Andreas Bacher, Markus Walther, Juned N. Kemal, Sebastian Randel, K. Koehnle, S. Muehlbrandt, Lothar Hahn, J. Schaefer, Yasar Kutuvantavida, Zheng Li, T. Harter, S. Ummethala
Publikováno v:
Nature Photonics
Nature photonics, 13 (8), 519–524
Nature photonics, 13 (8), 519–524
Future wireless communication networks will need to handle data rates of tens or even hundreds of Gbit s−1 per link, requiring carrier frequencies in the unallocated THz spectrum1,2. In this context, seamless integration of THz links into existing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df7d28b0056284034758d70e68d2fa00
Autor:
Axel Tessmann, Wolfgang Freude, Stefan Wolf, Juned N. Kemal, Matthias Blaicher, Hermann Massler, Lothar Hahn, Thomas Zwick, M. Weber, Sebastian Randel, T. Harter, Christian Koos, S. Muehlbrandt, Simon Nellen, Yasar Kutuvantavida, Björn Globisch, S. Ummethala, Markus Walther, F. Boes
Publikováno v:
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Over the past years, interest in wireless THz communications with so-called T-waves has tremendously increased [1]–[4], because the large carrier frequencies in the range 0.2 THz to 0.9 THz support wide signal band-widths and consequently large dat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80b74ea118dca9af0857f0001ace1fdc
https://publikationen.bibliothek.kit.edu/1000100785/111595492
https://publikationen.bibliothek.kit.edu/1000100785/111595492
110-m THz Wireless Transmission at 100 Gbit/s Using a Kramers-Kronig Schottky Barrier Diode Receiver
Autor:
T. Harter, S. Ummethala, Juned N. Kemal, Wolfgang Freude, Sebastian Randel, Christoph Füllner, Christian Koos, Erik Bründermann, Miriam Brosi
Publikováno v:
ECOC
2018 European Conference on Optical Communication (ECOC)
2018 European Conference on Optical Communication (ECOC)
We demonstrate wireless transmission of QPSK signals at a carrier frequency of 0.3 THz using a generalized Kramers-Kronig receiver with a Schottky barrier diode. We achieve a line rate of 100 Gbit/s over a transmission distance of 110 m.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::52bc9350fcce080139ef77b0f7062bfa
https://doi.org/10.1109/ecoc.2018.8535174
https://doi.org/10.1109/ecoc.2018.8535174
Autor:
Lothar Hahn, Hermann Massler, Markus Walther, J. Schaefer, S. Muehlbrandt, Yasar Kutuvantavida, Thomas Zwick, Juned N. Kemal, Christian Koos, Sebastian Randel, Andreas Bacher, Axel Tessmann, S. Ummethala, Suresh Kumar Garlapati, K. Koehnle, T. Harter, Wolfgang Freude, Zheng Li
Publikováno v:
ECOC
2018 European Conference on Optical Communication (ECOC)
2018 European Conference on Optical Communication (ECOC)
We report a THz wireless link at 0.2885 THz which is embedded in a photonic network. An ultra-broadBand plasmonic modulator directly converts the THz signal to the optical domain. We transmit QPSK data with line rates up to 50 Gbit/s.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::caf6482b0d73450bba497180e200ee88
https://doi.org/10.1109/ecoc.2018.8535490
https://doi.org/10.1109/ecoc.2018.8535490
Autor:
Heiner Zwickel, Wolfgang Freude, Philipp-Immanuel Dietrich, Matthias Blaicher, Clemens Kieninger, Delwin L. Elder, M. R. Billah, T. Hoose, M. Lauerrnann, S. Ummethala, Larry R. Dalton, Yasar Kutuvantavida, Argishti Melikyan, Christian Koos, T. Harter, S. Muehlbrandt, Stefan Wolf, Sebastian Randel
Publikováno v:
CLEO Pacific Rim Conference
Hybrid photonic integration allows to combine the complementary advantages of different material platforms while maintaining the processing and scalability advantages of monolithically integrated systems. Here we give an overview on our research in t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c2b3e202bc11241e540d198521222d5
Autor:
A. Schmid, Christian Koos, Wolfgang Freude, S. Ummethala, Lothar Hahn, S. Muehlbrandt, T. Harter, Simon Nellen
Publikováno v:
Nature Photonics
Nature photonics, 12 (10), 625–633
Nature photonics, 12 (10), 625–633
Optoelectronic signal processing offers great potential for generation and detection of ultra-broadband waveforms in the THz range, so-called T-waves. However, fabrication of the underlying high-speed photodiodes and photoconductors still relies on c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c01c6430a8f30f59147423a275d3c36
Autor:
Hermann Massler, Yasar Kutuvantavida, Axel Tessmann, Juned N. Kemal, K. Kohnle, Thomas Zwick, Suresh Kumar Garlapati, S. Ummethala, T. Harter, Markus Walther, Sebastian Randel, Christian Koos, Wolfgang Freude, J. Schaefer, Andreas Bacher, Lothar Hahn, S. Muehlbrandt
Publikováno v:
Conference on Lasers and Electro-Optics
Publons
Scopus-Elsevier
Publons
Scopus-Elsevier
We show a THz plasmonic modulator with flat frequency response from 40 MHz to 0.325 THz and employ it to demonstrate THz-to-optical conversion of a 30 Gbit/s signal on a 0.294 THz carrier.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15a38e6c4a886c51ddcd7db8c40dc8bf