Picture of Ulrike Höfler

M.Sc. Ulrike Höfler

Technical University of Munich

Associate Professorship of Line Transmission Technology (Prof. Hanik)

Postal address

Theresienstr. 90
80333 München


  • B.Sc. in Electrical and Computer Engineering, Technical University Munich (2017)
  • M.Sc. in Electrical and Computer Engineering, Technical University Munich (2020)
  • Since August 2020 research assistent at the Institute for Communications Engineering, Professorship of Line Transmission Technology


  • Optical Communication Systems WS 21/22
  • Optical Communication Systems WS 22/23


Available Theses

Strong Coupling Multimode Fibers

Multimode fibers, Space-division multiplexing


Space-division multiplexing (SDM), which consists in exploiting multimode (MMF) or multicore fibers instead of single mode ones, is one of the future architectures to increase data rates and network planning flexibility. A desired working condition for SDM is the so called strong-coupling linear regime, which is however not intrinsically achievable in common MMFs. With this topic, the student has the chance to investigate if it would be achievable with some new design. If you are curious about it, just send a mail to paolo.carniello@tum.de.


Basics of Optical Communication Systems (see https://www.ce.cit.tum.de/en/lnt/teaching/lectures/optical-communication-systems/)




Neural Network-Based Signal Predistortion for Direct Detection Systems


During the internship, the student will be researching the application of Neural Network-based signal predistortion to mitigate the effects of fiber chromatic dispersion in direct detection systems.


  • basic Python skills beneficial


Introduction to Photonic Crystal Fibers


Photonic crystal fibers (PCFs) have emerged as a promising platform for a wide range of applications due to their unique properties and design flexibility. These fibers consist of a periodic array of microstructured air holes that run along the length of the fiber, which enables precise control over the propagation of light. Of particular interest are hollow core fibers, which are characterized by a central void that enables light to be confined within the hollow core. As research and development in this field continue to advance, photonic crystal fibers are poised to play a pivotal role in the next generation of optical communication and sensing systems.

The students task is to provide a comprehensive overview of PCFs with a focus on characterizing their distinctive linear and nonlinear properties. 


Possible literature:

  • Philip St.J. Russell, "Photonic-Crystal Fibers," J. Lightwave Technol. 24, 4729-4749 (2006)
  • Benabid, F., and P. J. Roberts. "Linear and nonlinear optical properties of hollow core photonic crystal fiber." Journal of Modern Optics 58.2 (2011): 87-124.


  • lecture: Optical Communication Systems




  • Ulrike Höfler, Norbert Hanik: Phasenvorverzerrung bei Direktdetektion zur Entgegenwirkung der Chromatischen Faser Dispersion. ITG Workshop Modellierung optischer Komponenten und Systeme, 2023 more…
  • Ulrike Höfler, Norbert Hanik: Phase-Predistortion to Mitigate Chromatic Dispersion Effects in Direct Detection Systems. 24. VDE ITG Fachtagung Photonische Netze, 2023 more…


  • Norbert Hanik, Tasnad Kernetzky, Yizhao Jia, Ulrike Höfler, Ronald Freund, Colja Schubert, Isaac Sackey, Gregor Ronniger, Lars Zimmermann: 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 )
  • Ulrike Höfler, Norbert Hanik: Phase-Predistortion of Optical On-Off-Keying with Direct Detection to Counteract Fiber Chromatic Dispersion. IEEE Photonics Conference (IPC), 2022 more…
  • Ulrike Höfler, Tasnad Kernetzky, Norbert Hanik: 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 )


  • G. Ronniger, I. Sackey, T. Kernetzky, U. Höfler, C. Mai, C. Schubert, N. Hanik, L. Zimmermann, R. Freund, K. Petermann: 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…
  • Tasnad Kernetzky, Gregor Ronniger, Ulrike Höfler, Lars Zimmermann, Norbert Hanik: 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…
  • Ulrike Höfler: Modellierung der Material-Suszeptibilität in Silizium-Wellenleitern für FWM-basierende nichtlineare Optik. ITG Workshop Modellierung optischer Komponenten und Systeme , 2021 more…
  • Ulrike Höfler, Tasnad Kernetzky, Norbert Hanik: Modeling Material Susceptibility in Silicon for Four-Wave Mixing Based Nonlinear Optics. NUSOD (Numerical Simulation of Optoelectronic Devices ), 2021 more…