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Cladding-modulated Bragg gratings in silicon waveguides.

D T H Tan1, K Ikeda, Y Fainman

  • 1Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093-0409, USA. thtan@ucsd.edu

Optics Letters
|May 5, 2009
PubMed
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We demonstrate a new method for creating tunable optical filters using silicon-on-insulator waveguides and precisely placed cylinders. This approach offers a wide dynamic range for coupling strengths and bandwidths, essential for advanced photonic applications.

Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Bragg gratings are crucial for wavelength-selective optical devices.
  • Existing methods for tuning Bragg gratings often lack precision or a wide dynamic range.
  • Silicon-on-insulator (SOI) platforms offer advantages for integrated photonics.

Purpose of the Study:

  • To propose and demonstrate a novel cladding-modulated Bragg grating on an SOI platform.
  • To achieve precise control over coupling strength and bandwidth for optical filters.
  • To enable practical applications requiring specific bandwidth tunability.

Main Methods:

  • Implementing a Bragg grating using periodic cylinders adjacent to a waveguide on an SOI platform.
  • Modulating the coupling strength by adjusting the distance between cylinders and the waveguide.

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  • Utilizing modeling and experimental verification to validate the design.

    • Main Results:

    • Demonstrated coupling strengths varying by an order of magnitude (43 and 921 cm⁻¹).
    • Achieved tunable bandwidths of 8 nm and 16 nm.
    • Showcased high fabrication tolerance for weakly coupled devices.

    Conclusions:

    • The proposed cladding-modulated Bragg grating offers precise control over optical filter characteristics.
    • This method is suitable for integrated photonic devices with specific bandwidth requirements.
    • The design allows for the realization of robust, weakly coupled devices.