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Penalties From 2D Grating Coupler Induced Polarization Crosstalk in Silicon Photonic Coherent Transceivers

Georgieva, Galina; Sena, Matheus; Seiler, Pascal M.; Petermann, Klaus; Fischer, Johannes; Zimmermann, Lars

Silicon 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.
Published in: IEEE photonics journal, 10.1109/JPHOT.2022.3206619, IEEE