This paper presents an overview on new progresses of millimeter wave (mm-wave) radio-overfiber (RoF) system based on mm-wave generation by optical frequency multiplication (OFM), including generation of high-order optical side modes by optical modulation using dual-drive Mach-Zehnder modulator (DD-MZM) and enhancement of high-order optical side mode induced by selective amplification due to stimulated Brillouin scattering (SBS). The paper describes OFM by using DD-MZM in principle and verifies it in an experimental bidirectional 40 GHz RoF system. SBS amplification enhances the generated information-bearing mm-wave in downlink and also helps in producing a pure reference mm-wave for radio frequency-intermediate frequency (RF-IF) down-conversion in uplink. These efforts pushed the OFM technology of mm-RoF systems to achieve more and more feasibility and costeffectiveness.
This paper presents an overview on millimeter wave radio over fiber systems based on millimeter wave generation by optical frequency multiplication (OFM). The disadvantage of original OFM technique is checked and a novel bi-directional mm-RoF system based on new OFM technique using dual-drive MZM as high-order optical side-modes generator is proposed in principle and experimentally verified by a bi-directional mm-RoF system which not only produces 38 GHz information bearing signal in downstream, but also provides 40GHz local reference for down-conversion of upstream signal. Finally the advantage of OFM technique in reducing fading effect of fiber dispersion is theoretically proved.
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