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About
Kouichi Akahane is a leading researcher in free-space optical (FSO) communications, specializing in high-speed, mobile optical links for next-generation connectivity. His major contributions center on overcoming the fundamental challenge of beam misalignment in mobile environments. Akahane pioneered a three-stage high-speed optical beam stabilizer combined with a 2-D photodetector array (2D-PDA) based diversity receiver, a system that actively compensates for rapid transmitter movement. His experimental demonstrations have achieved a landmark 40-Gbit/s mobile FSO link using PAM-4 modulation, successfully maintaining error-free performance even with a zigzag-moving transmitter traveling at 400 mm/s. This work, published in 2024 and 2025, has garnered early citations for its practical approach to enabling robust, high-capacity links for support robots and autonomous systems. By integrating spatial diversity reception with maximum-ratio combining digital signal processing, Akahane has effectively mitigated signal fading and turbulence effects, pushing FSO technology closer to real-world deployment in dynamic environments. His research is pivotal for applications requiring reliable, multi-gigabit wireless connections where traditional radio frequency links are impractical.
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