Compact efficient broadband grating coupler for silicon-on-insulator waveguides

Abstract

We have designed a high-efficiency broadband grating coupler for coupling between silicon-on-insulator (SOI) waveguides and optical fibers. The grating is only $13 \mathit{\mu }\mathrm{m}$ long and $12 \mathit{\mu }\mathrm{m}$ wide, and the size of the grooves is optimized numerically. For TE polarization the coupling loss to single-mode fiber is below 1 dB over a 35-nm wavelength range when using SOI with a two-pair bottom reflector. The tolerances to fabrication errors are also calculated.

© 2004 Optical Society of America

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