Directional-coupler-type polarization beam splitter with a bridged silicon wire waveguide for high polarization extinction ratios

초록

Integrated-type polarization beam splitters (I-PBSs) are very important devices for photonic integrated circuits because silicon photonic devices have an inherent polarization sensitivity [1]. Various approaches to high performance I-PBSs have been reported based on directional coupler (DC), plasmonics, and photonic crystal. However, most of the PBS devices have either a low polarization extinction ratio (PER) below 30 dB or a complicated device structure. In this paper, we present numerically calculated results on integrated directional-coupler PBS structure with a single bridged silicon wire waveguide on a silicon-on-insulator (SOI) wafer providing a high PER value above 30 dB for both TE and TM polarization modes.