基于光纤的新型矢量和微波光子移相器

摘要

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,并在此基础上设计了新型方案,通过引入可调分光器和保偏光纤来精确控制相移,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.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°的移相,并可通过功率放大器来补偿信号幅度损失.%The theory of fiber-based vector-sum microwave photonic phase shifter is investigated. A new structure of the phase shifter is designed and its model is studied. Adjustable optical divider and polarization-maintaining fiber are used in the structure, which can reduce the structural complexity and the coherent interference, and can enhance the controllability of the phase shifter. The effects on the phase and amplitude of the signals of the division factor and the frequency are analyzed. The phase shift above 140° is achieved and the attenuation of the amplitude of the signals can be compensated by power amplifier.