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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。
Aiming at the principle of fiber-based microwave photonic phase shifter in phased array antenna, a new scheme is designed. By introducing adjustable beamsplitter and polarization-maintaining fiber, the complexity of phase shifter and coherent interference loss are reduced. Optical fiber length accuracy requirements have greatly improved, thereby increasing the achievability and enhance the controllability of the phase shifter. The influence of the spectral coefficient and frequency on the phase and amplitude of the signal was studied, and a phase shift exceeding 140 ° was achieved. Finally, through the design of the NC voltage source to realize the adjustment of the drive voltage of the splitter, thereby changing the optical components of the two optical fibers and finally realizing the digital control of the output signal phase. The new microwave photonic phase shifter scheme easy to implement, and has a certain innovation.