M.Sc. Karl Tasnad Kernetzky
Technical University of Munich
Associate Professorship of Line Transmission Technology (Prof. Hanik)
- Research assistant at LNT, TUM since december 2014
- M.Sc. of Electrical Engineering at TUM, 2012-2014
- B.Sc. of Electrical Engineering at TUM, 2009-2012
Grundlagen der Informationstechnik (LB) (WS15 - Today)
Hauptseminar Digitale Kommunikationssysteme (SS15 - Today)
Optical communication links over single mode glass fibers are used for almost all recent ultra-fast data connections, like the back bone of the internet or interconnects between datacenters. The increasing amount of cloud and video-on-demand services requires higher transmission speeds and therefore updated communication systems.
There are different common ways to increase the data rate of a fiber optic communication link: one can use higher order modulation formats (also jointly with probabilistic shaping), simply deploy more fibers (which is expensive), use wavelength division multiplexing (already mostly exploited), or try to modulate different modes of a multi-core or multi-mode optical fiber, which are orthogonal transversal distributions of the optical field in the waveguide.
The capacity of the optical fiber channel is limited by its inherent nonlinear nature. One effect - among others - is a nonlinear distortion of the propagating signal's phase, which in principle can be conmpensated with digital back propagation, but requires way too much processing power for state-of-the-art digital signal processing.
An alternative technique is optical phase conjugation to compensate fiber nonlinearities, where lumped devices are inserted in the fiber link, which invert the signal's phase front. If repeatedly done, phase distortions can be corrected in the optical domain. The conjugation can be realized with integrated silicon devices, where the incident signal and two pump lasers interact over (nonlinear) Four-Wave Mixing (FWM) and generate the conjugated and amplified outbound signal. The FWM efficiency can be increased if the light waves are in different modes of the silicon waveguide. In my research, I am focusing on numerical simulations of waveguide modes and the related nonlinear signal propagation.
- Ultra-Broadband Optical Wavelength-Conversion Using Nonlinear Multi-Modal Optical Waveguides. 2022 13th International Symposium on Communication Systems, Network and Digital Signal Processing (CSNDSP), 2022 more… Full text ( DOI )
- Phase Matching for Multimode Four-Wave Mixing in Few-Mode Fibers and Nano-Rib Waveguides. arxiv.org, 2022 more…
- Analysis of Material Susceptibility in Silicon on Insulator Waveguides with Combined Simulation of Four-Wave Mixing and Linear Mode Coupling. Optical and Quantum Electronics, 2022 more… Full text ( DOI )
- Efficient Ultra-Broadband C-to-O Band Converter Based on Multi-Mode Silicon-on-Insulator Waveguides. European Conference on Optical Communication (ECOC) 2021, 2021 more…
- Bug oder Frature? Ein seltsamer Dispersionseffekt in einger Gradientenfaser. ITG Workshop Modellierung optischer Komponenten und Systeme, 2021 more…
- Numerical Optimization and CW Measurements of SOI Waveguides for Ultra-Broadband C-to-O-Band Conversion. European Conference on Optical Communication (ECOC) 2021, 2021 more…
- Multi Dimensional Optimization of Phase Matching in Multimode Silicon Nano-Rib Waveguides. Photonic Networks; 21st ITG-Symposium, 2020 more…
- DFG Status Meeting Vortrag. 2019 more…
- Ultra-Broadband All-Optical Photonic Processor. DFG Summer School Malaga 2019 more…
- Numerical Phase Matching for Four-Wave Mixing in Optical Waveguides. Joint Workshop on Coding and Communications 2019 2019 more…
- Numerical Phase Matching Optimization for Multimode Silicon Nano-Rib Waveguides. 21st International Conference on Transparent Optical Networks, 2019 more…