ICCCAS 2024 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: RF Parameter Estimation Assisted by Phase Modulation and Detection of Lightwave
Abstract: Lightwave is also used for assisting signal generation, processing, filtering, frequency upconversion of an RF signal. Owing to optical frequency extremely higher than that of RF signal and many photonic technology such as high-speed modulation, amplification, wavelength multiplexing/demultiplexing, the technique enables us to achieve wide- (or narrow-) frequency operation in RF signal processing. Avoidance from electromagnetic noises would be also attractive features of the photonics-assisted RF signal processing. Such an approach is so-called "microwave- and millimeter-wave photonics (MWP)".
By adopting MWP, an RF signal measurement have been also demonstrated [1]. In this invited talk, we describe recent progress of this technique. This technique is based on lightwave detection of a beat between two modulation lightwaves: one is modulated in phase using a reference RF signal, and the other is also phase-modulated using the RF signal under the test. By filtering the detection signal in frequency to acquire the lower-frequency component, parameters of the RF signal under the test can be estimated. In this procedure original frequency components in the range of tens of GHz in the detection signal do not used so that low frequency-range electronic circuit can be adopted for the RF parameter estimation.
In this scheme RF signal parameter can be also estimated even if its frequency under the test is increased, without increase of the reference RF signal frequency. Such a frequency extension has been realized by using deep optical phase modulation signal that also includes higher-order optical sidebands [2]. In this invited talk, this approach will be presented from the view of both model analysis and experimental verification. Part of this work was supported by JSPS (20H02141, 20K21878).