The opticalphasemodulator does not suffer from the bias drifting problem as it does not need DC bias.
由于光相位调制器不需要直流偏置，不会遇到直流偏置漂移问题。
2
A piezoelectric ceramic, based on the converse piezoelectric effect, was used as opticalphasemodulator to design a fiber differential interferometer.
基于压电陶瓷的逆压电效应，采用压电陶瓷作为光相位调制器设计了光纤微分干涉仪。
3
The diffracted light intensity on axis of a Spatial light Modulator (SLM) with Multi-level Phase Fresnel Zone Plate (MPFZP) is studied by diffraction optical method.