Design of an optical polarization and phase diversity network in silicon-on-insulator waveguides

An all-passive optical polarization and phase diversity network in silicon-on-insulator waveguides is proposed. It consists of two 2 × 2 MMI-MZIs, which work as polarization beam splitters, and two 4 × 4 MMI couplers, which work as 90°-hybrid. It is particularly suitable for silicon-based integration of polarization and phase diversity coherent receiver.