Generation of ultralow-phase-noise millimeter-wave signal using an electro-optics-modulation comb

Future wireless telecommunications and coherent radar systems will use the millimeter-wave (MW) band. For achieving these applications, the phase-noise reduction of signal generator (SG) will be important. Several low-phase-noise MW generation methods based on photonic technologies [1] have been reported. Since these methods need a laser cavity, the repetition frequency is almost fixed, and its tunable range is narrow. We show the novel method to greatly reduce the phase noise of standard SGs. In general, the phase noise of a SG becomes larger as the MW frequency increases. In this work, we show that the phase noise of a standard SG can be reduced using an electro-optics-modulation (EOM) comb [2].