Abstract
In this paper, a novel scheme to generate a high-order QAM W-band mm-wave signal is proposed, which avoids the usage of expensive and power hungry digital-to-analog converter (DAC). We numerically simulate m2-QAM mm-wave signal generation and investigate the influences of phase shift and SNR on the performance of the generated W-band signals. The numerical result shows that both SNR and the modulation order m are important factors which decide the quality of generated vector mm-wave signals. Besides, we experimentally demonstrate 10 Gb/s @80 GHz QPSK signal generation based on photonic-aided frequency quadrupled generation principle, which handles the phase noise issue effectively. Moreover, 10 Gb/s @80 GHz QPSK signal transmission over 1-km DSF and 1-m wireless link is also achieved. The experiment results indicate that BER can achieve 7% hard-decision forward error correction (HD-FEC) threshold of 3.8 × 10−3 when the optical power is above −5 dBm. Due to avoiding a bandwidth limited DAC, our proposed W-band QAM vector mm-wave signal generation with a simple structure is promising for the future high-speed 5G ROF-based communication application and beyond.
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