A Compact 2D Polarization Splitting Grating Coupler with Lens Tapers

We present a highly-efficient and ultra-compact polarization splitting grating coupler based on apodized designs of blazed gratings and lens tapers. Within the overall footprint $60 \times 60 \mu \mathrm{m}^{2}$, the simulated transmission of -2.2 dB at 1308nm and the crosstalk between two polarizations of -16 dB are achieved.