基于光纤的矢量和微波光子移相器研究

The Fiber Vector Sum Microwave Photonic Phase Shifter

针对相控阵天线中几种微波光子移相器的实现方法进行了分析比较,重点对基于光纤的微波光子移相器原理进行研究,并在此基础上设计了实现方案,通过引入光可调定向耦合器和保偏光纤,降低了移相器的复杂性和相干干涉损耗,增强了移相器的可控性。并对光纤精度控制进行了分析,最后给出了基于4路保偏光纤的0°-360°移相器方案。该方案易于实现且有一定的新颖性。

Several methods utilized in designing microwave photonic phase shifter in the phased array antenna are compared and analyzed,the theory of the fiber vector sum microwave photonic phase shifter is investigated,and the structure of the phase shifter is designed.Variable directional coupler and polarization-maintaining fiber are used in the structure,which can reduce the complexity of the phase shifter and the coherent interference loss,thus enhancing the controllable performance of the phase shifter.The accuracy control of the fiber is analyzed and the scheme contains four polarization-maintaining fiber is given to achieve the phase shift of.The experiment with this phase shifter scheme is made,and the result shows that the scheme is practical and feasible.