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Applied Optics

Applied Optics


  • Vol. 43, Iss. 16 — Jun. 1, 2004
  • pp: 3315–3318

Y-branch spot-size converter for a buried silica waveguide with large index difference

Qian Wang, Jianjun He, and Sailing He  »View Author Affiliations

Applied Optics, Vol. 43, Issue 16, pp. 3315-3318 (2004)

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Coupling loss occurs between a standard single-mode fiber and a silica waveguide when the difference between the refractive indices of the core and the cladding of the silica waveguide is high. We designed a Y-branch structure for use as a spot-size converter to reduce this coupling loss. The structure was tested with a three-dimensional beam-propagation method and was shown to exhibit a significantly reduced coupling loss, a low polarization-dependent loss, and a good tolerance of imprecision in fabrication. No additional fabrication steps are required for this proposed spot-size converter.

© 2004 Optical Society of America

OCIS Codes
(130.1750) Integrated optics : Components
(230.7380) Optical devices : Waveguides, channeled
(230.7390) Optical devices : Waveguides, planar

Original Manuscript: September 25, 2003
Revised Manuscript: March 3, 2004
Published: June 1, 2004

Qian Wang, Jianjun He, and Sailing He, "Y-branch spot-size converter for a buried silica waveguide with large index difference," Appl. Opt. 43, 3315-3318 (2004)

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