基于受激布里渊散射的二倍频光电振荡器

Frequency-doubling optoelectronic oscillator based on stimulatedBrillouin scattering

为了打破器件带宽限制,提高光电振荡器(optoelectronic oscillator, OEO)的频率范围,设计了一种基于受激布里渊散射的二倍频光电振荡器。系统并联了相位调制器(phase modulator, PM)和双平行马赫曾德尔调制器(dual parallel Mach Zender modulator, DP-MZM),利用受激布里渊散射效应(stimulated Brillouin scattering,SBS)实现相位调制器的相位转幅度调制;打破±1阶边带平衡,利用光电探测器(photodetector, PD)拍频得到基频10 GHz信号;驱动DP-MZM,使其工作在最小传输点,实现载波抑制双边带调制(double side band with suppressed carrier, DSB-SC)产生二倍频20 GHz信号。实验结果显示,所设计的振荡器在OEO环路中基频信号为10 GHz的情况下,产生了20 GHz的二倍频信号,通过分析其边模抑制比性能、频率功率稳定性及相位噪声对系统性能进行验证。

In order to break the device bandwidth limitation and increase the frequency range of the optoelectronic oscillator(OEO),a diphasic OEO based on stimulated Brillouin scattering is designed in this paper.A phase modulator(PM)and a dual parallel Mach Zender modulator(DP-MZM)are connected in parallel to achieve a phase shift in the phase modulator using the Stimulated Brillouin scattering(SBS)effect.The phase to amplitude modulation of the phase modulator breaks the±1st order sideband equilibrium and uses the photodetector(PD)to tap the frequency to obtain a 10 GHz signal at the fundamental frequency;at the same time,the DP-MZM is driven to operate at the minimum transmission point to realize the double side band with suppressed carrier(DSB-SC)modulation to generate a 20 GHz signal at double frequency.The experimental results show that a 20 GHz double-band signal is generated with a 10 GHz fundamental frequency signal in the OEO loop.The system performance is verified by analyzing its edge-mode rejection ratio performance,frequency power stability and phase noise.