摘要
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。
A photonic scheme based on dual-parallel Mach-Zehnder modulator（MZM）and four-wave mixing of a semiconductor optical amplifier（SOA）is proposed to generate microwave signals with a frequency of 24 times of that of the radio 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 suppress 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 twelfth sidebands would be generated due to the four-wave mixing effect,so that a microwave signal with a frequency of 24 times of that of the radio frequency signal can be obtained.Finally,simulation is performed to verify the feasibility of the scheme.When the frequency of the driving signal is 10 GHz,microwave signal with frequency of 240 GHz is achieved.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2014年第10期1926-1930,共5页
Journal of Optoelectronics·Laser
