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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 17 — Aug. 18, 2008
  • pp: 13024–13031

Enhancing alignment tolerance of silicon waveguide by using a wide grating coupler

Jong-Moo Lee, Kap-Joong Kim, and Gyungock Kim  »View Author Affiliations

Optics Express, Vol. 16, Issue 17, pp. 13024-13031 (2008)

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We fabricate a 20 µm wide grating coupler for a single-mode thermally-expanded-core (TEC) fiber, in order to enhance positional tolerance in alignment. The minimal coupling loss is measured at 5 dB per facet and the optical 3 dB bandwidth is measured at 40 nm. The 3 dB alignment tolerance is measured at ±7.5 µm in horizontal direction and +290 µm in vertical direction. The 1 dB alignment tolerance is measured at ±4.2 µm in horizontal direction and +125 µm in vertical direction. The alignment tolerance is enhanced twice in horizontal direction and four times in vertical direction, compared with the coupling of a standard single-mode fiber to a standard 10 µm wide grating coupler which is also fabricated in this experiment.

© 2008 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.3120) Integrated optics : Integrated optics devices
(230.7390) Optical devices : Waveguides, planar

ToC Category:
Integrated Optics

Original Manuscript: June 9, 2008
Revised Manuscript: August 7, 2008
Manuscript Accepted: August 8, 2008
Published: August 11, 2008

Jong-Moo Lee, Kap-Joong Kim, and Gyungock Kim, "Enhancing alignment tolerance of silicon waveguide by using a wide grating coupler," Opt. Express 16, 13024-13031 (2008)

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