Ultra-compact dual-mode silicon power splitter using sub wavelength gratings couplers

We propose and demonstrate a 3dB optical power splitter based on silicon on insulator (SOI) platform. Simulations results show that 50:50 split ratio for TE₀ and TE₁ modes can be achieved simultaneously by mode dispersion engineering. A compact size of 28.1μm can be achieved by introducing subwavelength gratings (SWG) structure. The proposed device can be utilized for multi-mode signal processing.