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Opt Lett. 2010 Apr 15;35(8):1290-2. doi: 10.1364/OL.35.001290.

Highly efficient nonuniform grating coupler for silicon-on-insulator nanophotonic circuits.

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Joint Research Center of Photonics of the Royal Institute of Technology, Sweden.


We present design, fabrication, and characterization of a silicon-on-insulator grating coupler of high efficiency for coupling between a silicon nanophotonic waveguide and a single mode fiber. By utilizing the lag effect of the dry etching process, a grating coupler consisting of nonuniform grooves with different widths and depths is designed and fabricated to maximize the overlapping between the upward wave and the fiber mode. The measured waveguide-to-fiber coupling efficiency of 64% (-1.9 dB) for the transverse electric polarization is achieved by the present nonuniform grating coupler directly defined on a regular silicon-on-insulator wafer.

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