Silicon-on-Insulator Fundamental to First-Order Dual Polarization Mode Converter based on Si-Si3N4 Phase Plate Waveguide

A silicon-on-insulator fundamental to first-order mode converter with both polarization capability is proposed. The device is based on ditching half-width of propagating silicon waveguide with a silicon nitride substrip of length 0.8 μm. The proposed device has a very simple structure, a low insertion loss of −1.5dB, and a low crosstalk of −12.81 dB at a wavelength of 1550nm for transverse electric (TE) polarization.