基于可调谐真相移的可调谐光电振荡器

提出一种基于真相移(TPS)实现可调谐光电振荡器( OEO)的方案。只需通过调谐Mach-Zehnder 调制器(MZM)的偏置电压,就可以实现可谐滤波器的频谱响应的改变,即可实现TPS滤波器。 其中,两个抽头的可调谐滤波器是由双光源、双调制器以及叠印光栅来实现。OEO的输出频 率由二抽头可调 谐滤波器的峰值频率决定,而滤波器可调谐,这样就可以实现输出OEO的输出频率可调。 仿真结果表明,输出频率可以实现5～10GHz宽带宽可调谐。

A tunable optoelectronic oscillator based on tunable true phase shift

A novel wideband tunable optoelectronic oscillator (OEO) based on the tunable tr ue phae shift is proposed in this paper.A two-tap photonic microwave filter with a tunable complex coefficient an d a real coefficient is constructed using double lasers,double Mach-Zehnder mod ulators (MZMs) and two cascaded fiber Bragg gratings (FBGs).The complex coeffici ent is realized by the true phae shifter,and the real coefficient can be control led by the optical power.The reconfiguration of the photonic microwave filter is realized by adjusting the bias voltage applied on the MZM.When the system is cl osed,a microwave frquency will oscillate around the peak frequency of the bandpa ss filter,the long fiber will decrease the phae noise of the microwave signal,an d the short fiber will increase the mode spacing to keep a single mode oscillati ng in the loop.The peak frequency of the filter can be tuned by changing the bia s voltage according to the need of OEO.As a result,the output frequency of OEO c an be tuned from 5GHz to 10GHz,the tunability range is large but the method is simple.