Research Publications About Contact
Scientist  ·  PhD Candidate  ·  University Lecturer

In‑Ho Baek

Advancing 6G Photonic
Networks &
THz Wireless

Fraunhofer Heinrich Hertz Institute, Berlin — designing experimental THz systems and adaptive DSP that push wireless beyond 100 Gbit/s at 300 GHz.

Let's Collaborate  → View Research
Affiliated with
Fraunhofer TU Berlin HTW Berlin BHT Berlin KIT KAIST IEEE

01 — Research

Areas of Focus

My work spans the full THz signal chain — from photonic upconversion and probabilistic shaping to converged optical/wireless 6G architectures.

Terahertz Wireless
Communications

Experimental 300 GHz (WR-3) transmission systems with photonic upconversion. Demonstrated throughputs exceeding 109 Gbit/s, and a record 221 Gb/s dual-polarisation link over 500 m.

Probabilistic Constellation
Shaping & Rate Adaptation

Rate-adaptive modulation approaching the Shannon limit. Time-adaptive PCS for combined optical/THz links, plus neural-network-based photodiode nonlinearity mitigation.

Converged Optical & THz
Links for 6G Networks

Seamless integration of THz wireless into fiber-optic backhaul. Adaptive baseband techniques for converged links — the core of my PhD dissertation at TU Berlin.

Neuromorphic
Photonic Computing

Optical signal processing on integrated photonic chips using neural network architectures — enabling modulation format identification, optical signal correction, and low-power feature generation entirely in the optical domain.

02 — Publications

Research Output

First-author papers highlighted. Google Scholar  •  IEEE Xplore

01

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

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

IEEE PTL Accepted
02

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

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

OECC Accepted
03

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

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

JLT 2025
04

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

In-Ho Baek, O. Stiewe, J. Gläsel, M. F. Ulukan, A. Schindler, F. Ganzer, T. T. Tran

MWP 2024
05

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

In-Ho Baek, O. Stiewe, S. Nellen, G. Schwanke, R. Elschner, C. Schubert

IET 2023
06

Time Adaptive Probabilistic Shaping for Combined Optical/THz Links

In-Ho Baek, F. Bart, R. Elschner, F. Meier, D. Hellmann, A. Maassen, C. Schubert

ITG 2022
07

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

R. Elschner, F. Bart, F. Meier, O. Stiewe, IH Baek et al.

JLT 2025
08

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

C. Schubert, R. Elschner, O. Stiewe, IH Baek et al.

OFC 2025
09

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

C. Schmidt-Langhorst, J. Pfeiffer, R. Elschner, R. Emmerich, F. Chowanek, IH Baek, R. F. H. Fischer, C. Schubert

ITG 2022
Google Scholar IEEE Xplore

03 — Expertise

Technical Skills

Research Areas
Terahertz (THz) Wireless Probabilistic Shaping Photonic Upconversion 6G Network Design Coherent Optical Comms Advanced DSP
Technologies
WR-3 Band (300 GHz) PIN Photodiode Tx WR3-Coupled Transceivers 800G Coherent ASICs QAM Modulation Neural Network DSP
Tools & Methods
MATLAB THz Experimental Testbeds Oscilloscopes Spectrum Analysers Signal Generators
Languages
German — Native Korean (한국어) — Native English — Fluent

04 — Contact

Let's build
the future
of wireless.

in-ho.baek@proton.me
Fraunhofer Institute for Telecommunications — HHI Department of Photonic Networks and Systems Berlin, Germany
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