Grating fiber-chip coupler (GC) is a versatile scheme to couple light into submicron waveguides, particularly in SOI platform [1]. Typical GC is defined within a footprint of 10 × 10 μm to match the fiber mode field. The 10 μm wide waveguide is then adiabatically tapered (length ~ 500 μm) down to a 400/500 nm single-mode waveguide. To reduce the taper length, focusing type grating was introduced and widely used [2]. One of the major issues with the focusing GC is the alignment tolerance and bandwidth limitation compared to linear GC. In this paper, we propose and demonstrate an ultra-compact taper structure with coupling efficiency of ~92% for 1550 nm and 89% for 1310 nm and broad band operation.

© 2017 IEEE

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