Xu Wei, Jin Tao, Chi Hao
Opt Express. 2013 Dec 30;21(26):32516-23. doi: 10.1364/OE.21.032516.
We propose and demonstrate a frequency multiplying optoelectronic oscillator with nonlinearly-coupled double loops based on two cascaded Mach-Zehnder modulators, to generate high frequency microwave signals using only low-frequency devices. We find the final oscillation modes are only determined by the length of the master oscillation loop. Frequency multiplying signals are generated via nonlinearly-coupled double loops, the output of one loop being used to modulate the other. In the experiments, microwave signals at 10 GHz with -121 dBc/Hz phase noise at 10 kHz offset and 20 GHz with -112.8 dBc/Hz phase noise at 10 kHz offset are generated. Meanwhile, their side-mode suppression ratios are also evaluated and the maximum ratio of 70 dB is obtained.
我们提出并演示了一种基于两个级联马赫曾德尔调制器的具有非线性耦合双环的倍频光电振荡器，以仅使用低频器件来生成高频微波信号。我们发现最终的振荡模式仅由主振荡环的长度决定。倍频信号通过非线性耦合双环生成，其中一个环的输出用于调制另一个环。在实验中，生成了偏移10 kHz时相位噪声为-121 dBc/Hz的10 GHz微波信号以及偏移10 kHz时相位噪声为-112.8 dBc/Hz的20 GHz微波信号。同时，还评估了它们的边模抑制比，获得的最大比值为70 dB。
