We report on compact focusing polarization diversity grating couplers in silicon-on-insulator, which can be used to overcome the polarization dependence of nanophotonic integrated circuits. The minimum fiber-to-fiber polarization dependent loss is 0.4 dB and the focusing grating couplers are as performant as standard 2-D-grating couplers without focusing. In addition, the focusing property of the gratings results in an 8-fold length reduction of the coupling structure as compared to standard nonfocusing 2-D-grating versions.
© 2009 IEEE
Frederik Van Laere, Wim Bogaerts, Pieter Dumon, Günther Roelkens, Dries Van Thourhout, and Roel Baets, "Focusing Polarization Diversity Grating Couplers in Silicon-on-Insulator," J. Lightwave Technol. 27, 612-618 (2009)