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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 27 — Dec. 19, 2011
  • pp: 26406–26415

Weakly modulated silicon-dioxide-cladding gratings for silicon waveguide Fabry-Pérot cavities

Richard R. Grote, Jeffrey B. Driscoll, Claudiu G. Biris, Nicolae C. Panoiu, and Richard M. Osgood, Jr.  »View Author Affiliations

Optics Express, Vol. 19, Issue 27, pp. 26406-26415 (2011)

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We show by theory and experiment that silicon-dioxide-cladding gratings for Fabry-Pérot cavities on silicon-on-insulator channel (“wire”) waveguides provide a low-refractive-index perturbation, which is required for several important integrated photonics components. The underlying refractive index perturbation of these gratings is significantly weaker than that of analogous silicon gratings, leading to finer control of the coupling coefficient κ. Our Fabry-Pérot cavities are designed using the transfer-matrix method (TMM) in conjunction with the finite element method (FEM) for calculating the effective index of each waveguide section. Device parameters such as coupling coefficient, κ, Bragg mirror stop band, Bragg mirror reflectivity, and quality factor Q are examined via TMM modeling. Devices are fabricated with representative values of distributed Bragg reflector lengths, cavity lengths, and propagation losses. The measured transmission spectra show excellent agreement with the FEM/TMM calculations.

© 2011 OSA

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(130.3120) Integrated optics : Integrated optics devices
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Integrated Optics

Original Manuscript: October 6, 2011
Revised Manuscript: November 29, 2011
Manuscript Accepted: November 29, 2011
Published: December 12, 2011

Richard R. Grote, Jeffrey B. Driscoll, Claudiu G. Biris, Nicolae C. Panoiu, and Richard M. Osgood, "Weakly modulated silicon-dioxide-cladding gratings for silicon waveguide Fabry-Pérot cavities," Opt. Express 19, 26406-26415 (2011)

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