Highly efficient nonuniform grating coupler for silicon-on-insulator nanophotonic circuits
- 15 April 2010
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 35 (8), 1290-1292
- https://doi.org/10.1364/ol.35.001290
Abstract
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.Keywords
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