为了获得更高频率的信号, 采用了一种基于并联马赫-曾德尔调制器(MZM)和半导体光纤四波混频效应的二十四倍频光生毫米波方案。本振信号被并联MZM调制后可以获得高纯度的±4阶边带, 在四波混频效应下, 又可以生成±12阶边带, 用级联的布喇格光栅滤波器滤除±4阶边带, 经光电探测器拍频便可生成二十四倍频信号。结果表明, 当输入本振信号为5GHz时, 生成的120GHz高频微波毫米波信号射频杂散抑制比为22dB, 频谱纯度很高, 且具有很好的可调谐性。该研究为高频微波毫米波信号的生成提供了更高的倍频方法。

In order to get higher frequency signal, a 24-tupling frequency microwave millimeter-wave signal generation scheme based on parallel Mach-Zehnder modulators (MZM) and semiconductor optical amplifier (SOA) four-wave mixing effect was presented and simulated. The local oscillator signal was modulated by parallel MZM to obtain high-purity ±4 sidebands. Under the four-wave mixing effect, the ±12 sidebands were generated. The ±4 sideband was filtered by cascaded Bragg grating filters. After the beat frequency of photoelectric detector, 24-tupling frequency signal was generated. The results show that, when input local oscillator signal is 5GHz, radio frequency spurious rejection ratio of the generated 120GHz high frequency microwave millimeter wave signal is 22dB. The spectrum purity is high, and the tunability is good. This study provides a high frequency doubling method for the generation of high frequency microwave and millimeter wave signal.