Fig. 10From: Design and performance analysis of integrated focusing grating couplers for the transverse-magnetic TM00 mode in a photonic BiCMOS technologyExemplary experimental coupling loss spectra of TE (a) and TM (b) rib FGCs for different slab heights – a shallowly etched (s-rib) waveguide with a slab height of 150 nm and a deeply etched (d-rib) waveguide with a slab height of 100 nm. The coupling angle is 14°Back to article page