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A novel all optical WDM up-conversion system using frequency quadruple technique is proposed. The proposed system can be utilized in the future 60-GHz band WiMAX RoF system.
Both highly spectral-efficient direct-detection 15-Gb/s 64-QAM and 20-Gb/s 16-QAM OFDM signals are demonstrated. Negligible penalty is observed following 25-km SMF transmission.
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