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In this letter, a six-port direct modulator with carrier leakage suppression is proposed and experimentally demonstrated for downlinks in the future high-speed high-carrier-frequency wireless communication systems. To handle high carrier frequencies and provide good performance, GaAs metal–semiconductor field-effect transistor RF switches are used to complete the modulation. Up to 500-MBd quadrature...
A complete scheme by integrating baseband-over-fiber link and six-port direct modulation is proposed and experimentally demonstrated for uplinks in future high-speed high-frequency wireless communications systems. To handle high frequencies, GaAs MESFET RF switches are used to interface the baseband in-phase (I) and quadrature (Q) signals to six-port modulator. The baseband I and Q signals are transported...
We design a cost-effective broadband radio over fiber (RoF) transceiver based on 1310 nm 10 GbE commercial off the shelf (COTS) optical components, with up to 4.3 GHz bandwidth. The suppression of 3rd intermodulation distortion (IMD3) is as high as 50dBc, and the spurious-free dynamic range (SFDR) of RoF links based on this transceiver reaches 85 dB/Hz2/3. An error vector magnitude (EVM) of 3% is...
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