Abstract
What we believe to be a novel high-efficiency grating coupler that can couple out a flat-top-like beam profile is proposed. Theory analyses and simulation results are shown in the design with optimized parameters. The power-up from the optimized grating coupler is over 83.9% (−0.76dB) at the center wavelength of 1550 nm with the 3 dB bandwidth of about 140 nm. The flat-top area of the output light at a height of 1 µm above the waveguide surface is about 14×14µm2, which is applicable in the illumination field for many optical sensors.
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