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Compact chip-scale filter based on curved waveguide Bragg gratings.

Steve Zamek1, Dawn T H Tan, Mercedeh Khajavikhan

  • 1Department of Electrical and Computer Engineering, University of California, San Diego,9500 Gilman Drive, La Jolla, California 92093-0407, USA. szamek@ucsd.edu

Optics Letters
|October 23, 2010
PubMed
Summary
This summary is machine-generated.

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We developed a new method using curved waveguide Bragg gratings for miniaturizing optical filters on chips. This technique enhances performance by eliminating fabrication errors in long gratings.

Area of Science:

  • Photonics
  • Integrated Optics
  • Nanotechnology

Background:

  • Miniaturization of optical filters is crucial for dense integration on photonic chips.
  • Fabrication of long Bragg gratings often suffers from stitching errors, degrading performance.
  • Curved waveguide designs offer a potential solution for compact optical devices.

Purpose of the Study:

  • To propose and validate a method for miniaturizing optical filters using cascaded curved waveguide Bragg gratings.
  • To eliminate stitching errors associated with traditional long Bragg gratings.
  • To design and fabricate a compact filter on a silicon-on-insulator platform.

Main Methods:

  • Development of an analytical model for analyzing cascaded curved waveguide Bragg gratings.

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  • Design and fabrication of a filter utilizing curved gratings with identical radii of curvature.
  • Characterization of the fabricated filter's performance, including stop band and extinction ratio.

    • Main Results:

    • A miniaturized filter with a total length of 920μm was successfully fabricated.
    • The filter occupied a compact area of 190μm×114μm.
    • The device demonstrated a 1.7nm stop band at 1.55μm with an extinction ratio exceeding 23dB.

    Conclusions:

    • Cascading curved waveguide Bragg gratings is an effective method for miniaturizing optical filters.
    • This approach successfully overcomes fabrication limitations of long Bragg gratings.
    • The demonstrated silicon-on-insulator filter shows high performance in a small footprint, suitable for integrated photonics.