Affiliated with
Advancing 6G Photonic
Networks &
THz Wireless
01 — Latest News
Recent updates on publications, awards, and teaching.
Returning as Lecturer at HTW Berlin this winter semester, teaching Nachrichtenübertragung 2 (NUE2).
Won the pitch competition at Deep Tech Night: Quantum & Photonics in Berlin, pitching LUXONNIC to a room of investors, researchers, and founders.
Speaking at Deep Tech Night: Quantum & Photonics in Berlin, presenting LUXONNIC to investors, researchers, and founders alongside four other photonics and quantum startups.
View Event →Set a new world record: 221 Gb/s dual-polarization THz wireless transmission over 500 m in urban Berlin at 300 GHz, achieving a rate–distance product exceeding 100 Tb/s·m — the highest reported to date.
Paper published at the Opto-Electronics and Communications Conference (OECC): “Record 221 Gb/s Dual Polarization THz Wireless Transmission Over 500 m Using PCS-64QAM at 300 GHz.”
Awarded the Paper Award at OECC 2026 for a record 221 Gb/s dual-polarization THz wireless transmission over 500 m in urban Berlin, a rate–distance product exceeding 100 Tb/s·m in the 300 GHz band.
View on LinkedIn →Paper accepted to IEEE Photonics Technology Letters (PTL): “Neural-Network Based Transceiver Nonlinearity Mitigation for Probabilistically Shaped Photonic THz Wireless Transmission.”
Started co-founding LUXONNIC as CEO, an early-stage venture at Fraunhofer HHI developing photonic neural transceivers for AI data centers, and submitted a funding proposal to the BMFTR xG-Incubator programme (StartUpConnect).
Started as Lecturer at HTW Berlin, teaching the B.Sc. programme in Information and Communication Technology.
Paper published in the Journal of Lightwave Technology (JLT): “Experimental Characterization of Photodiode Transmitters for Probabilistically Shaped High-Speed THz Wireless Transmission.”
Co-authored paper published in the Journal of Lightwave Technology (JLT): “Analysis of Weather-Related Link Availabilities for Fiber-Integrated THz-Wireless Transmission Systems.”
Co-authored paper presented at the Optical Fiber Communication Conference (OFC): “High-Capacity THz Wireless Transmission Supporting Future 6G Optical Networks.”
Paper presented at the International Topical Meeting on Microwave Photonics: “Experimental Characterization of a WR3-Coupled Photodiode Transmitter for High-Speed Terahertz Wireless Communication.”
Paper published in IET Conference Proceedings: “32 GBd, 109 Gbit/s Probabilistically Shaped THz Wireless Transmission using PIN-PD Based Photonic Upconversion.”
Started as Lecturer at BHT Berlin, teaching in the M.Sc. Information and Communication programme.
Paper presented at the 23rd ITG-Symposium Photonic Networks: “Time Adaptive Probabilistic Shaping for Combined Optical/THz Links.”
Co-authored paper presented at the 23rd ITG-Symposium Photonic Networks: “Experimental Investigation of Information Bit Scrambling for Physical-Layer Security in Coherent Fiber-Optic Systems.”
Awarded the Baden-Württemberg Scholarship.
02 — Research
From experimental 300 GHz THz links to neuromorphic photonics. Building the physical layer of 6G.
Experimental 300 GHz (WR-3) transmission systems built on photonic upconversion, from PIN-photodiode transmitters to receiver-side DSP. Demonstrated throughputs beyond 200 Gbit/s, with a record 221 Gb/s dual-polarisation link over 500 m.
Rate-adaptive probabilistic shaping approaching the Shannon limit, integrated into converged fiber–THz backhaul architectures for 6G. The subject of my PhD dissertation at TU Berlin.
Optical signal processing on integrated photonic chips using neural networks: modulation format identification, signal correction, and feature extraction, entirely in the optical domain at sub-nanosecond latency.
03 — Venture
Co-Founder & CEO of an early-stage deep-tech venture, developed at Fraunhofer HHI, working to reinvent the optical transceiver for AI data centers.
“Becoming the secret sauce of next-gen transceivers.”
LUXONNIC is developing the LUXONNICore, a photonic integrated circuit that performs signal equalization directly in the optical domain using photonic neural networks, replacing the power-hungry DSP chips inside next-generation (LPO/CPO) transceivers.
04 — Publications
First-author papers highlighted. Google Scholar • IEEE Xplore
In-Ho Baek, J. Honecker, M. Bittiehn, R. Elschner, C. Schubert, R. Freund
In-Ho Baek, O. Stiewe, R. Elschner, M. Rösch, A. Tessmann, M. Nölle, L. Molle, C. Schubert, R. Freund
Paper Award -- OECC 2026
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
In-Ho Baek, O. Stiewe, J. Gläsel, M. F. Ulukan, A. Schindler, F. Ganzer, T. T. Tran
In-Ho Baek, O. Stiewe, S. Nellen, G. Schwanke, R. Elschner, C. Schubert
In-Ho Baek, F. Bart, R. Elschner, F. Meier, D. Hellmann, A. Maassen, C. Schubert
R. Elschner, F. Bart, F. Meier, O. Stiewe, IH Baek et al.
C. Schubert, R. Elschner, O. Stiewe, IH Baek et al.
C. Schmidt-Langhorst, J. Pfeiffer, R. Elschner, R. Emmerich, F. Chowanek, IH Baek, R. F. H. Fischer, C. Schubert
