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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 35 — Dec. 10, 2005
  • pp: 7540–7547

Compact double-grating coupler between vertically stacked silicon-on-insulator waveguides

Po Dong and Andrew G. Kirk  »View Author Affiliations


Applied Optics, Vol. 44, Issue 35, pp. 7540-7547 (2005)
http://dx.doi.org/10.1364/AO.44.007540


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Abstract

We analyze a compact double-grating coupler that provides coupling through radiation modes between two vertically stacked silicon-on-insulator waveguides. The grating is sufficiently strong to be considered a one-dimensional photonic bandgap structure that facilitates a short coupling length. Simulations suggest that a 29% coupling efficiency is achievable in coupling light from one waveguide to another with 12.9 µm long binary gratings. We found that the coupling efficiency is enhanced by Fabry-Perot resonance between two gratings. The coupling efficiency can be increased by use of a blazed grating. We use the eigenmode expansion method to design and optimize the binary grating coupler, and the results are verified by use of the finite-difference time-domain method.

© 2005 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.1950) Optical devices : Diffraction gratings
(230.7390) Optical devices : Waveguides, planar

ToC Category:
Optical Devices

Citation
Po Dong and Andrew G. Kirk, "Compact double-grating coupler between vertically stacked silicon-on-insulator waveguides," Appl. Opt. 44, 7540-7547 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-35-7540


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