Picture of Karl Tasnad Kernetzky

M.Sc. Karl Tasnad Kernetzky

Technical University of Munich

Associate Professorship of Line Transmission Technology (Prof. Hanik)

Postal address

Theresienstr. 90
80333 München


  • 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


Available Theses

Theses in Progress

Research interests

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.

Silicon Waveguide, c.f. I. Sackey et al., “1.024 Tb/s wavelength conversion in a silicon waveguide with reverse-biased p-i-n junction,“ Optics Express 25
Transversal Modes of the Silicon Waveguide



  • Kernetzky, T.: Optical Waveguide Modes And How to Compute Them. Munich Doctoral Seminar on Communications (MSC), 2018 more…
  • Günlü, O.; Kernetzky, T.; Iscan, O.; Sidorenko, V.; Kramer, G.; Schaefer, R. F.: Secure and Reliable Key Agreement with Physical Unclonable Functions. Entropy, Special Issue on Information Theoretic Security 20 (5), May 2018, Article 340 more… Full text ( DOI )


  • Kernetzky, T.: System and Design Aspects of Zynq FPGA Programming. Joint Workshop on Coding and Communications, Mar 2017 more… Full text (mediaTUM)