研究了一种基于二次外差法的八倍频毫米波光子发生器.该方案将二次外差法的相关原理应用到倍频式毫米波光子发生器的研究中.利用两次拍频, 抵消两个独立激光器各自的相位噪声, 得到了频率八倍于射频本振频率的射频毫米波信号.理论推导了毫米波产生的原理, 讨论了影响射频功率代价的激光器相位噪声、光纤色散和光链路的延时失配问题, 在此基础上进行了仿真模拟验证了光子发生器的工作原理及在模拟光链路中的应用.

A prototype of frequency 8-tupling millimeter-wave photonic generator based on improved two-step heterodyne was proposed and analyzed. In the proposal, two step heterodyne technique was employed to eliminate the phase noise of two phase uncorrelated lasers. Millimeter-wave signal with frequency eight time of driving frequency was obtained. We theoretically analyzed the generators principle and the issue of power penalty induced by lasers phase noise, fiber dispersion and optical time delay. To verify the mechanism and the discussion, simulation was carried out to verify the principle.