Fig. 2
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Schematics of vertical fiber-to-chip coupling scheme. (a) Illustration of the fiber-to-chip edge coupling into the PIC. (b) Geometry of the two-layer adiabatic taper for efficient mode conversion between L-4 and L-2 waveguides. (c) Schematic of the EBL-to-OL coupling stage. The red arrows depict the light propagation through the structures.
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