Naokatsu Yamamoto

National Institute of Information and Communications Technology

Papers

Total Citations

H-Index

About

Naokatsu Yamamoto is a leading researcher in high-speed free-space optical (FSO) communications, with a focus on enabling robust, mobile optical links for next-generation networks and support robotics. His major contributions center on overcoming the fundamental challenge of beam instability in mobile FSO systems. He has pioneered the development of a three-stage high-speed optical beam stabilizer, which actively compensates for rapid transmitter movement, and combined it with a two-dimensional photodetector array (2D-PDA) for spatial diversity reception. This innovative approach, paired with maximum-ratio combining digital signal processing, effectively mitigates signal fading caused by misalignment and atmospheric turbulence. Yamamoto’s experimental work has demonstrated a landmark 40-Gbit/s mobile FSO link using PAM-4 modulation, achieving error-free performance within a 7% forward error correction (FEC) threshold even with a zigzag-moving transmitter at 400 mm/s. His 2024 and 2025 papers, each garnering 3 citations, represent critical steps toward practical, high-capacity mobile optical wireless systems. This work is pivotal for applications requiring reliable, high-throughput connectivity for autonomous robots and mobile platforms, positioning Yamamoto as a key innovator in the field of agile optical wireless technology.