Low polarization dependent beam deflector based on Bragg reflector waveguide for C-band wavelength demultiplexing

摘要

We report a miniature beam deflector with a large angular dispersion based on a Bragg reflector waveguide operating in a full-C band. The device is extremely small with an effective footprint of 20 × 100 μm~2. Continuous beam deflection of over 40° was obtained with large angular dispersion of ~l°m. Polarization dependence was largely alleviated by optimizing the optical core thickness. Further decrease in the polarization dependence below 0.1° can be expected after considering the material birefringence inside the waveguide. A possible channel number can exceed 300, which could be the highest in C-band demultiplexing technologies ever reported.