CC BY 4.0 UnportedGeorgieva, GalinaSena, MatheusSeiler, Pascal M.Petermann, KlausFischer, JohannesZimmermann, Lars2022-11-222022-11-222022https://oa.tib.eu/renate/handle/123456789/10403http://dx.doi.org/10.34657/9439Silicon photonic two-dimensional grating couplers for C- and O-band dual-polarization coherent transceivers are analyzed with respect to their polarization splitting/combining performance. Due to scattered light in the grating's plane, a linear cross-polarization results. The latter is responsible for a limited polarization split ratio and a polarizations' non-orthogonality. The impact of these two quantities is evaluated by system-level simulations with regard to OSNR penalties in coherent systems. For both C- and O-band, a design modification for reduced penalties is proposed.enghttps://creativecommons.org/licenses/by/4.0/6202D grating couplerscoherent transceiversorthogonalitypolarization crosstalkpolarization splittingsilicon photonicsArticle