Abstract
We have demonstrated a novel 22 Gbit/s 64 QAM scheme to generate orthogonal frequency division multiplexing (OFDM) signals for radio over fiber (ROF) systems using cost-effective optical filter fiber Bragg grating (FBG). We employ the FBG because the repetitive frequency of the RF source and the bandwidth of the optical modulator are largely reduced and the architecture of the ROF system is simpler. It can be considered as a low-cost solution because a low RF oscillator is employed to generate optical mm-wave signal with frequency quadrupling. By the simulation results, the influence of fiber dispersion can be almost neglected by employing the OFDM signals. This novel scheme which has multiple double-frequency technique to generate mm-wave signal to carry OFDM signals is attractive for the future cost-effective systems.
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