ICCCAS 2025 Invited Speaker

Akito Chiba

Gunma University, Japan

Biography: Akito Chiba received his B.E. degree in electric and precision engineering, and his M.E. and Ph.D. degrees in the field of electronics and information engineering from Hokkaido University, Sapporo, Japan, in 2000, 2002, and 2005, respectively. From 2005-2010, he worked with the Lightwave Devices Project of the New-Generation Network Research Center, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo, Japan, where he engaged with Lithium Niobate electrooptic devices and their applications to optical communication. From 2010-2011, he joined the Faculty of Engineering, Shizuoka University, Hamamatsu, Shizuoka, Japan, where he served as a Postdoctoral Fellow for CREST Project of Japan Science and Technology Agency, and he was involved in the development of a cathodoluminescent thin film for electron-beam-assisted high-resolution optical imaging. From 2011 he has been with Gunma University, Kiryu, Gunma, Japan, and now he serves as an associate professor in the Division of Electronics and Informatics, Faculty of Science and Technology of the University. In 2018 he was also a visiting scholar at the Department of Electrical and Computer Engineering, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles. His current research interests include the field of applied optics, fiber optics, and RF photonics, utilizing modulation and demodulations for optical communication, measurement, and RF signal processing. Dr. Chiba is a member of Optica (formerly the Optical Society (OSA)), IEEE Photonics Society (IEEE-PS), the Japan Society of Applied Physics (JSAP), the optical society of Japan (OSJ), and the Institute of Electronics, Information, and Communication Engineering of Japan (IEICE).
Speech Title: Polarization manipulation utilizing negative-index optical modulation and its application
Abstract: In this talk we will explain polarization manipulation of each optical sideband by utilizing negative-index optical modulation. Using a polarization-rotation technique based on the optical modulation technique in a Sagnac interferometer, rejection of undesired optical sidebands has been achieved by a polarizer. Its application to generate wide frequency-separation pair of coherent monochromatic lightwaves is also explained. Long-term stability and wavelength tunability over 40-nm range in C-band wavelength has been revealed in the lightwave pair generated by this technique, besides excellent suppression ratio of undesired lightwave components. Such a pair of lightwaves called to be “optical two-tone (OTT) signals” would be useful in a Radio-over-fiber system to enhance capacity of wireless communication systems.