DESIGN OF HIGH-FREQUENCY ZNO-COATED OPTICAL-FIBER ACOUSTOOPTIC PHASE MODULATORS

In this paper, we present a theory of an optical fiber acoustooptic ph ase modulator using piezoelectric zinc oxide (ZnO) coating. The effect s of changing device parameters in the acoustooptic resonator are inve stigated for transducer design. These results are entirely different f rom those of the well-known planar device structure since every part p lays an important role in the resonator structure. Optical phase modul ation in the frequency region up to 1 GHz is also demonstrated. Multip le sharp resonance peaks with a maximum phase shift of 0.7 radians are observed.