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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 24,
  • Issue 10,
  • pp. 3810-3815
  • (2006)

Light Injection in SOI Microwaveguides Using High-Efficiency Grating Couplers

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Abstract

An experimental characterization of the grating couplers for sub-micrometer silicon-on-insulator (SOI) waveguides is presented. The grating couplers have been designed, realized, and characterized for the +1 diffraction order at an operating wavelength of 1.31 μm for TE polarization. At the resonant angle, a coupling efficiency higher than 55% has been measured. The angular coupling range and the wavelength tolerance have been evaluated to 3° and 20 nm, respectively. The grating coupler is followed by a taper, and about 50% of the input power at 1.31 μm is coupled into sub-micrometer rib and strip SOI waveguides. The ration between light power decoupled toward the cladding and light power decoupled toward the substrate is about three.

© 2006 IEEE

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