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A simplified and cost-effective architecture is proposed and experimentally demonstrated with a millimeter wave (MMW) signal over fiber and free-space wireless transmission. The distributed feedback (DFB) laser is operated in optimized settings after measuring its characteristics and thus the 6 Gbps 64-quadrature amplitude modulation (64-QAM) signal can be successfully transmitted after 20-and 50-km fiber and 1-meter wireless transmission with EVM of 5.98% and 6.87%, respectively. Moreover, the EVM of 10.8% over 100-km long reach is also achieved with the 32-QAM modulation format and data rate of 5 Gbps. The experimental results show that the proposed direct modulation scheme can satisfy applications in metro and rural areas.

RF fading in an RoF system is circumvented by managing the frequency notch through the control of a polarization modulator. W-band signals centralized at 90 GHz with 10GHz operation bandwidth are fully utilized with stable EVM performance.