新型数控光纤矢量和微波光子移相器

Novel numerical control fiber vector-sum microwave photonic phase shifter

针对相控阵天线中基于光纤的微波光子移相器原理进行研究,并设计了新型方案,通过引入可调分光器和保偏光纤,降低了移相器的复杂性和相干干涉损耗,在对光纤长度的精度要求上有很大改善,从而提高了可实现性,增强了移相器的可控性。研究了分光系数和频率对信号相位和幅度的影响,实现了超过140°的相移。最后通过设计数控电压源实现对分路器驱动电压的调整,从而改变两路光纤的光分量,最终实现对输出信号相位的数字控制。该新型微波光子移相器方案易于实现,并具有一定的创新性。

Theory of the fiber vector-sum microwave photonic phase shifter was investigated, and the new-type structure of the phase shifter was designed. Variable directional coupler and polarization- maintaining fiber were used in the structure, which could reduce the complex and the coherent interference, the precision requirement of the fiber length, which could be decreased, and the realizability and the controllable of The Novel Numerical Control fiber vector-sum microwave photonic phase shifter could be also enhanced. The affections on the phase of division index and frequency were analyzed. The and amplitude of the signals which from the change phase shift above 140~ was achieved. The numerical control voltage source was designed to adjust the driving voltage of the directional coupler to change the light intensity in the fiber. The numerical control on the phase of the output signal was achieved finally. This microwave photonic phase shifter can be realized easily and has some novelty.