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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 1 — Jan. 9, 2006
  • pp: 148–161

Monolithically integrated asymmetric graded and step-index couplers for microphotonic waveguides

A. Delâge, S. Janz, B. Lamontagne, A. Bogdanov, D. Dalacu, D.-X. Xu, and K.P. Yap  »View Author Affiliations

Optics Express, Vol. 14, Issue 1, pp. 148-161 (2006)

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A monolithically integrated asymmetric graded index (GRIN) or step-index (GRIN) mode converters for microphotonic waveguides are proposed and described. The design parameters and tolerances are calculated for amorphous silicon (a-Si) couplers integrated with silicon-on-insulator waveguides. The GRIN and step-index couplers operate over a wide wavelength range with low polarization dependence, and the lithographic resolution needed is only ±1 μm. Finally, experimental results are presented for a single layer 3 μm thick step-index a-Si coupler integrated on a 0.8 μm thick SOI waveguide. The measured variation of coupling efficiency with coupler length is in agreement with theory, with an optimal coupling length of 15 μm for this device.

© 2006 Optical Society of America

OCIS Codes
(130.0130) Integrated optics : Integrated optics
(130.5990) Integrated optics : Semiconductors
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

A. Delâge, S. Janz, B. Lamontagne, A. Bogdanov, D. Dalacu, D.-X. Xu, and K. P. Yap, "Monolithically integrated asymmetric graded and step-index couplers for microphotonic waveguides," Opt. Express 14, 148-161 (2006)

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