Li, HeHeLiRoelkens, GuntherGuntherRoelkens2026-05-072026-05-072025979-8-3315-0619-31949-2081https://imec-publications.be/handle/20.500.12860/59374Scaling computing infrastructure requires optical I/O with higher bandwidth density and lower power consumption. We propose a bi-layer grating coupler on a low-loss silicon nitride platform for heterogeneously integrated VCSELs using micro-transfer printing. Simulations show a -1.2 dB coupling efficiency from VCSELs to the waveguide.engProceedings paper10.1109/SiPhotonics64386.2025.10984830WOS:001556149600025