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In-Ho Baek
Fraunhofer HHI  ·  TU Berlin  ·  HTW Berlin

In-Ho Baek

Scientist at the Department of Photonic Networks and Systems, Fraunhofer HHI — developing high-capacity THz wireless systems, adaptive DSP, and photonic transmitter components for 6G network integration.

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Profile

I am a Scientist at the Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute (HHI), Berlin, within the Department of Photonic Networks and Systems, where I have been working since July 2021. In parallel, I am pursuing a PhD (Dr.-Ing.) at Technische Universität Berlin (TUB) under the working title “Investigating Adaptive Baseband Techniques for Converged Optical / THz Wireless Links.”

My research focuses on high-capacity Terahertz (THz) wireless communications and their integration into next-generation 6G photonic network infrastructures. I develop advanced DSP algorithms for rate-adaptive THz links and conduct experimental characterisation of photonic transmitter components for probabilistically shaped, high-speed THz wireless transmission beyond 100 Gbit/s.

Alongside my research role, I serve as a University Lecturer at HTW Berlin and BHT Berlin, covering communications engineering and signal processing at Bachelor’s and Master’s level.

Education
2021 –
2026

PhD — Electrical Engineering / Information Technology

Technische Universität Berlin (TUB), Berlin — 2026
Working title: Investigating Adaptive Baseband Techniques for Converged Optical / THz Wireless Links
Desired degree: Dr.-Ing.
2018 –
2021

M.Sc. — Electrical Engineering / Information Technology

Karlsruhe Institute of Technology (KIT), Karlsruhe — 2021
Focal points: Communication Engineering & Optical Communications
Master Thesis (at IPQ, KIT): Data-Aided Carrier Phase Recovery Algorithms for Coherent Optical Communication Systems
2018 –
2019

Exchange Programme — Electrical Engineering & Philosophy

Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea — 2018–2019
Courses: Radar Systems Engineering • MIMO Wireless Communications • Philosophy of Science
Supported by the Baden-Württemberg Scholarship 2018
2014 –
2018

B.Sc. — Electrical / Information Engineering

Karlsruhe Institute of Technology (KIT), Karlsruhe — 2018
Bachelor Thesis (at IMS, KIT): Investigation of the Timing Jitter of Superconducting Single Photon Detectors with Varying Meander Shapes
Experience
Jul 2021 –
Present

Scientist — Fraunhofer Heinrich Hertz Institute (HHI), Berlin

July 2021 – present

Department of Photonic Networks and Systems

  • Advanced DSP development for rate-adaptive THz wireless communications
  • DSP on chip for high-speed coherent 800G ASICs
  • Device and experimental setup characterisation
  • Project management and scientific collaboration
Oct 2025 –
Mar 2026

Lecturer — HTW Berlin University of Applied Sciences

October 2025 – March 2026

B.Sc. programme: Information and Communication Technology

  • Fundamentals of telecommunications and communication systems
  • Digital signal processing and modulation schemes
  • Introduction to wireless and optical transmission systems
Oct 2022 –
Mar 2024

Lecturer — Berlin University of Applied Sciences and Technology (BHT Berlin)

October 2022 – March 2024

M.Sc. programme: Information and Communication Technology

  • Advanced communications engineering and system design
  • Optical and wireless transmission technologies
  • Channel coding, adaptive modulation, and probabilistic shaping
Apr 2020 –
Jun 2021

Student Trainee, Project Engineer — EnBW, Karlsruhe

April 2020 – June 2021

Rheinhafen Steam Power Plant RDK

  • Calculation, reconstruction, and infrastructure adjustments of the power plant high-voltage site grid
Oct 2020 –
Apr 2021

Master Thesis — Institute of Photonics and Quantum Electronics (IPQ), KIT

October 2020 – April 2021

Data-Aided Carrier Phase Recovery Algorithms for Coherent Optical Communication Systems

Apr 2019 –
Mar 2020

Working Student — Siemens, Karlsruhe

April 2019 – March 2020

Digital Industries — Factory Automation

2015 –
2016

Teaching Assistant — Karlsruhe Institute of Technology (KIT)

2015 – 2016

Teaching Assistant for the course Electric Circuits

  • Held tutorial classes
  • Corrected and graded exercise sheets
Publications

First Author

Accepted

Neural-Network Based Transceiver Nonlinearity Mitigation for Probabilistically Shaped Photonic THz Wireless Transmission

IEEE Photonics Technology Letters (PTL)

In-Ho Baek, J. Honecker, M. Bittiehn, R. Elschner, C. Schubert, R. Freund

Accepted

Record 221 Gb/s Dual Polarization THz Wireless Transmission Over 500 m Using PCS-64QAM at 300 GHz

Opto-Electronics and Communications Conference (OECC)

In-Ho Baek, O. Stiewe, R. Elschner, M. Rösch, A. Tessmann, M. Nölle, L. Molle, C. Schubert, R. Freund

2025

Experimental Characterization of Photodiode Transmitters for Probabilistically Shaped High-Speed THz Wireless Transmission

Journal of Lightwave Technology

In-Ho Baek, O. Stiewe, J. Gläsel, S. Nellen, G. Schwanke, T. T. Tran, R. Elschner, C. Schubert, R. B. Kohlhaas, P. Runge, M. Schell, R. Freund

2024

Experimental Characterization of a WR3-Coupled Photodiode Transmitter for High-Speed Terahertz Wireless Communication

Int. Topical Meeting on Microwave Photonics

IH Baek, O. Stiewe, J. Gläsel, M. F. Ulukan, A. Schindler, F. Ganzer, T. T. Tran

2023

32 GBd, 109 Gbit/s Probabilistically Shaped THz Wireless Transmission using PIN-PD Based Photonic Upconversion

IET Conference Proceedings CP839

IH Baek, O. Stiewe, S. Nellen, G. Schwanke, R. Elschner, C. Schubert — pp. 1302–1305

2022

Time Adaptive Probabilistic Shaping for Combined Optical/THz Links

23rd ITG-Symposium Photonic Networks

IH Baek, F. Bart, R. Elschner, F. Meier, D. Hellmann, A. Maassen, C. Schubert — pp. 1–8

Co-Author

2025

Analysis of Weather-Related Link Availabilities for Fiber-Integrated THz-Wireless Transmission Systems

Journal of Lightwave Technology

R. Elschner, F. Bart, F. Meier, O. Stiewe, In-Ho Baek, S. Schütze, A. Maaßen, K. Das, R. B. Kohlhaas, S. Nellen, M. Deumer, T. Merkle, A. Tessmann, M. Rösch, C. Schubert, R. Freund, M. Schell

2025

High-Capacity THz Wireless Transmission Supporting Future 6G Optical Networks

Optical Fiber Communication Conference (OFC) — M3D.1

C. Schubert, R. Elschner, O. Stiewe, IH Baek, S. Schütze, A. Maaßen, K. Das, R. B. Kohlhaas, S. Nellen, M. Deumer, T. Merkle, A. Tessmann, M. Rösch, F. Meier, F. Bart, R. Freund, M. Schell

2022

Experimental Investigation of Information Bit Scrambling for Physical-Layer Security in Coherent Fiber-Optic Systems

23rd ITG-Symposium Photonic Networks

C. Schmidt-Langhorst, J. Pfeiffer, R. Elschner, R. Emmerich, F. Chowanek, IH Baek, R. F. H. Fischer, C. Schubert — pp. 1–6

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