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设计了一种利用微波光子滤波器(MPF)实现频率可调谐的光电振荡器(OEO)。该模型通过双驱动Mach-Zehnder调制器(DD-MZM)和啁啾光栅形成高Q值的MPF,得出OEO的振荡频率是关于光源波长和DD-MZM直流偏置电压的函数,通过对光源波长或DD-MZM偏置电压的调整,可实现振荡频率调谐功能。同时,在电域上,利用RF耦合器和RF延时线形成两路具有延时差的反馈信号,通过合并后反馈至DD-MZM,从而有效地抑制边模。理论和仿真实验表明,针对不同的调谐范围可实现粗调和微调的功能。
A kind of optoelectronic oscillator (OEO) which can be tuned by microwave photon filter (MPF) is designed. In this model, a high-Q MPF is formed by a dual-drive Mach-Zehnder modulator (DD-MZM) and a chirped grating. It is found that the oscillation frequency of OEO is a function of the wavelength of the source light and the DC bias voltage of the DD-MZM. Wavelength or DD-MZM bias voltage adjustment, oscillation frequency tuning function can be realized. At the same time, in the electric domain, the RF coupler and the RF delay line are used to form two feedback signals with delay difference, which are combined to feedback to the DD-MZM, thereby effectively suppressing the side mode. Theoretical and simulation experiments show that coarse tuning and fine tuning can be achieved for different tuning ranges.