Compact, Broadband, and Polarization-insensitive 3 dB power splitter on silicon

An ultra-compact, ultra-broadband and polarization-insensitive 2×2 3 dB power splitter on silicon is proposed and demonstrated with a coupling region as short as 4.6 μm. The fabricated 3dB power splitter works very well for both TE and TM polarizations in a broad band from 1520 nm to 1610 nm.