Radio technologies play essential roles in telecommunication and imaging for public infrastructure including mass transportation systems such as high-speed trains, jet liners, etc. Available radio-wave spectrum would not be wide enough to mitigate huge demands for such applications. One of possible solutions would be to use many small cells with optical networks, where wired and wireless seamless systems based on convergence of radio and lightwave technologies will be useful to connect many small cells to optical networks. This paper review high-speed communication and high-performance radar systems based on radio and optical seamless connections.

Tetsuya Kawanishi (M¡¯06-SM¡¯06-F¡¯13) received the B.E., M.E., and Ph.D. degrees in electronics from Kyoto University, Kyoto, Japan, in 1992, 1994, and 1997, respectively. From 1994 to 1995, he was with the Production Engineering Laboratory of Panasonic. During 1997, he was with the Venture Business Laboratory, Kyoto University, where he was engaged in research on electromagnetic scattering and on near-field optics. In 1998, he joined the Communications Research Laboratory, Ministry of Posts and Telecommunications (now the National Institute of Information and Communications Technology, NICT), Tokyo, Japan, where he was the Director of Lightwave Devices Laboratory of NICT. During 2004, he was a Visiting Scholar in the Department of Electrical and Computer Engineering, University of California at San Diego. From 2015,  he is a Professor at Department of Electronic and Physical Systems, Faculty of Science and Engineering, Waseda University, and the Research Executive Director of Network System Research Institute, at NICT. His current research interests include high-speed optical modulators and RF photonics.v