Microwave photonic phase shifters based on phase control of optical carrier and sidebands

In order to realize a novel microwave photon phase shifter with 360° phase shift, the phase of radio frequency signal was controlled by using a phase modulator, delay line and optical filter to control the phase of carrier and sideband. The phase modulator only needs to control a voltage to adjust the phase shift angle. The effect of drift caused by the use of complex dual-parallel Mach-Zehnder modulator (DPMZM) was reduced. The system had the advantages of simple structure and low cost. The results show that, the microwave photonic phase shifter can achieve full phase shifting from 0°~360° in the frequency range of 0GHz~40GHz. And at the same output phase and under the frequency ranges from 0GHz to 40GHz, the power is basically unchanged. This research has certain reference significance for microwave photonic phase shifter technology.