TE-Pass Polarizer With Cylinder Array Inserted in Buffer Layer of Silica-on-Silicon Waveguide

A TE-pass polarizer with cylinder array inserted in buffer layer of silica-on-silicon waveguide (CABL-WG) is proposed. The polarization characteristics of the CABL-WG are analyzed by means of the full vectorial finite element method at a wavelength of 1550 nm, where the low loss of TE fundamental mode could be made while the TM fundamental mode has very large leakage loss. The optimization design for the polarizer with ultralow insertion loss of 0.07 dB and high extinction ratio of 38.94 dB is given.