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Optics Letters

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  • Vol. 19, Iss. 11 — Jun. 1, 1994
  • pp: 798–800

Normal-incidence grating couplers in Ge-Si

J. Sarathy, R. A. Mayer, K. Jung, S. Unnikrishnan, D.-L. Kwong, and J. C. Campbell  »View Author Affiliations


Optics Letters, Vol. 19, Issue 11, pp. 798-800 (1994)
http://dx.doi.org/10.1364/OL.19.000798


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Abstract

We report a normal-incidence grating coupler that is monolithically integrated with a GexSi1−x rib waveguide. The design, fabrication, and testing procedures are described for a 0.33-μm-period grating coupler integrated with a Ge0.04Si0.96 waveguide. Also, a theoretical analysis based on coupler-mode theory has been carried out to predict the coupling efficiency and its dependence on the angle of incidence of light. For normal incidence the measured efficiency of 6.5% was found to be in good agreement with the theoretical prediction of 6.9%. The measured FWHM of the acceptance angle about the normal was 5°, compared with the theoretical prediction of 3°.

© 1994 Optical Society of America

History
Original Manuscript: February 1, 1994
Published: June 1, 1994

Citation
J. Sarathy, R. A. Mayer, K. Jung, S. Unnikrishnan, D.-L. Kwong, and J. C. Campbell, "Normal-incidence grating couplers in Ge-Si," Opt. Lett. 19, 798-800 (1994)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-19-11-798


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