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In this paper, we evaluate by means of simulation and experimentally the simultaneous coupling of the LP 01x -LP 11ax fiber modes and the TE 0 -TE 1 nanophotonic SOI waveguide modes using a grating coupler for a two-mode fiber at 1550 nm. Both the grating width (ranging from 10 µm to 15 µm) and the grating vertical profile have been considered in the design procedure. The optimum design (14 µm width and 609 nm grating period) has been selected in terms of coupling efficiency (both LP 01x -TE 0doi:10.1364/oe.26.019445 pmid:30114116 fatcat:dotyy6sncjf47kumszudh6tgki