基于双平行MZM调制器和四波混频效应的高倍频微波信号的光学生成

提出了一种基于双平行Mach-Zehnder调制器(DPMZM ) 和半导体光放大器(SOA ) 的四波混频(FWM ) 效应的 24 倍频微波信号光学生成方案,具有覆盖频段高、系统结构简单 和 频谱纯度较高等优点。在本方案中,低频率的微波信号 通过 DPMZM 对光源进行调制,调节直流偏置点使 DPMZM 的两个子 MZM 和主 MZM 均偏置在最大传输点,抑制 所有 奇数边带,进一步调节两个子 MZM 的调制深度和移相器的相移,完全抑制光载波和二阶边带,得到±4阶光边带；再经 过 SOA 发生FWM效应 , 产生±12 光边带,经过光电探测器拍频后可获得 24 倍频的微波信号。最后,通过仿真实验, 以 10GHz 的微波信号为驱动信号,得到了 240GHz 的微波信号,验证了方案的可行性。

Photonic generation of microwave signals with high multiplied frequency based on dual-parallel MZM and four wave mixing

A photonic scheme based on dual- parallel Mach - Zehnder modulator (MZM) and four - wave mixing of a semiconductor optical amplifier (SOA) is propose d to generate microwave signals with a frequency of 24times of that of the radi o frequency signal,with the advantages of wide frequency coverage,simple system structure and high spectral purity . In this scheme,a low - frequency microwave signal modulates the light wave in a dual - parallel MZM in which two sub MZMs and MZM are all biased at the maximum transmission point via adjusting the dc bias to sup press the odd - order sidebands. Then the optical carrier and the second sidebands at the output of the dual -parallel MZM can be suppressed by properly adjusting modulation indices of the MZM and phase shift of the phase shifter, resulting in the generation of the fourth sidebands.The fourth sidebands are then injected into the SOA,the twelf th sidebands would be generated due to the four -wave mixing effect,so that a microwave signal with a frequency of 24times of that of the radio f requency signal can be obtained.Finally,s imulation is performed to verify the feasibility of the scheme.When t he frequency of the driving signal is 10GHz,microwave signal with frequency of 240GHz is achieved.