Broadband and Fabrication Tolerant Silicon Polarization Beam Splitters with Ultra-high Extinction Ratio of 40 dB. - Thomas Y. L. Ang; Jun Rong Ong; Ezgi Sahin; Bryan Pawlina; George F. R. Chen; Dawn T. H. Tan; Soon Thor Lim; Ching Eng Png (OFC, 2018)