INTERIM RESEARCH RESULTS ON RADIO ON FIBER COMMUNICATION NETWORK IN TAO, JAPAN

Yokosuka ITS research center was founded by TAO (Telecommunications Advancement Organization of Japan) in 1999. Since then the research center has been conducting R&D on info-communication system technologies relating to ITS, which include three study items of wireless agent technology, Radio on Fiber (ROF) communication system technology, and wireless multi-mode terminal technology. Out of the three study items, this paper presents some interim R&D results on ROF communication system technology after three years' activities. The developed DSRC (Dedicated Short Range Communications) access network system utilizing the ROF technique with a function of diversity-handover between the adjacent radio zones is described in the paper, and also several technical items for ROF such as E/O conversion device, a compensation method of inter-modulation, dynamic radio zone control, and a beam controlled array antenna are described.