Polarization Control Device Based on Silicon Waveguide and Phase Change Material

A polarization control device based on silicon waveguide and phase change material, comprising a polarization rotation beam splitter, an optical beam splitter component, a phase shifter component, and a polarization rotation beam combiner, wherein

• the polarization rotation beam splitter comprises an adiabatic tapered silicon waveguide, an asymmetric directional coupler, a multi-mode interference mode filter, an upper output end mode transition cone, and a lower output end mode transition cone;
• an input end of the polarization rotation beam splitter is connected to an input optical fiber;
• the optical beam splitter component comprises a first optical beam splitter and a second optical beam splitter, and the phase shifter component comprises a first phase shifter, a second phase shifter, a third phase shifter, and a fourth phase shifter, wherein the first phase shifter, the second phase shifter, the third phase shifter, and the fourth phase shifter are all optical phase shifters of silicon waveguide and phase change material, an input end of the first optical beam splitter is connected to an output end of the polarization rotation beam splitter, a first output end of the first optical beam splitter is connected to the first phase shifter, and a second output end of the first optical beam splitter is connected to the second phase shifter;
• an input end of the second optical beam splitter is connected to the first phase shifter and the second phase shifter, respectively, a first output end of the second optical beam splitter is connected to the third phase shifter, and a second output end of the second optical beam splitter is connected to the fourth phase shifter;
• and
• an input end of the polarization rotation beam combiner is connected to the third phase shifter and the fourth phase shifter, respectively.