Ultra broadband polarization splitter for advanced photonics applications

Monolithic integration of polarization splitters is crucial for effective polarization management in photonic integrated circuits (PICs). This work presents a broadband polarization splitting technique using adiabatic couplers and compact total internal reflection mirrors on a thick silicon-on-insulator platform. The approach provides wavelength-independent and polarization-dependent phase shifts. Recent demonstrations achieved over 15 dB polarization extinction ratio across a 450 nm wavelength range, supporting applications in optical communication, healthcare, and quantum optics.