The Rescher Of Full-Duplex Rof System

As the development of informational society, the requirement of capacity and quality communication is increasing rapidly, in which the Radio over Fiber (RoF) technology comes to being. RoF technology combines the optical fiber and wireless technology. The low attenuation and almost unlimited bandwidth advantages of optical fiber technology meet the need of high speed, high frequency millimeter-wave’s long distance transmission, and the wireless technology provides a convenient access way in user terminal. Nowadays, RoF technology focuses on the generation of millimeter-wave signal, long distance transmission and demodulation technology more and more. The Passive Optical Network (PON) has its advantages in solving the problem of "Last Kilometre" access, so the combination of RoF and PON technology attacts lots attention of researchers.In this paper, firstly, we introduce the background, features, application and development of RoF technology, and the advantage of PON technology. We highlight the generation of optical millimeter-wave signal, and compare the difference between double sideband modulation (DSB), single sideband modulation (SSB) and optical carrier suppression (OCS) of external modulation technology. Also we investigate frequency multiplication technology in obtaining frequency quadrupling millimeter-wave signal. Secondly, we put forward a full-duplex RoF link with16-ary QAM vector modulation on lOGbit/s binary data and using frequency quadrupling to generate the60GHz millimeter-wave signal. Thirdly, we propose a full-duplex hybrid wired/wireless link with Gbit/s 16-ary QAM format, which can provide wired and wireless access alternately for the user terminal, and the remote base station free from the lightwave source. The simulations for both wired and wireless accesses show the good performance of the hybrid optical signal. Lastly, a conclusion and prospect of this paper are given in the final chapter.