Hybrid plasmonic polarization splitter using three-waveguide directional coupler in InGaAsP/InP

چکیده مقاله

We investigated a polarization beam splitter based on a three-waveguides directional coupler by utilizing a hybrid plasmonic waveguide as the middle waveguide. The structure of the proposed polarization splitter is compatible to the InP based conventional waveguide. So, it has the capability of monolithic integration with InP-based active (lasers and photodetectors) and passive components. Polarization splitting is obtained by optimizing the coupling length, the InP-cladding layer thickness, and the gap between straight waveguides. Calculations show a coupling length of about 27 µm and 350 µm for the TM- and TE-polarization mode, respectively, an extinction ratio of 17dB, and an insertion loss of less than 1dB for a gap width of 30 nm and InP-cladding layer thickness of 135 nm at 1.55 µm wavelength.