介绍了基于光实时延迟线、基于外差混频技术和基于矢量和技术的光子射频移相器，对其工作原理和技术特点作了分析。
Photonic RF phase shifters based on OTTD (optical true time delay), heterodyne mixing technique and vector sum technique were introduced. The principles and features were proposed and analyzed.
四波混频效应重新分配不同振荡线的能量从而产生多波长输出。
FWM effect redistributes the energy of different oscillating lines and causes multi-wavelength operation.
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