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Apodized SCISSORs for filtering and switching.

Sang-Yeon Cho1, Richard Soref

  • 1Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, New Mexico 88003-8001, USA. sangycho@nmsu.edu

Optics Express
|July 8, 2009
PubMed
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Researchers simulated novel silicon-on-insulator optical filters and switches (SCISSOR devices) achieving rectangular passbands and efficient optical switching. These advancements enable tunable filtering and wavelength-division multiplexing applications.

Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Waveguided silicon-on-insulator (SOI) devices are crucial for integrated photonics.
  • Existing microring resonator designs often lack precise control over filter shapes and switching performance.
  • The SCISSOR (an in-line array of microring resonators) architecture offers potential for advanced optical functionalities.

Purpose of the Study:

  • To simulate and optimize 1550-nm silicon-on-insulator SCISSOR devices for novel filtering and switching applications.
  • To achieve "rectangular" filter-passband shapes, a previously unreported characteristic in resonant optics.
  • To demonstrate high-extinction 2x2 optical switching capabilities.

Main Methods:

  • Simulation of SCISSOR devices at 1550 nm wavelength.

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  • Optimization of array number, ring-bus coupling, and inter-ring spacing.
  • Application of ring-bus apodization to enhance filter characteristics.
  • Reduction of free spectral range (FSR) and manipulation of effective refractive index for switching.

    • Main Results:

    • Engineered "rectangular" (box-like) bandpass filters with tunable width (5-50% of FSR).
    • Achieved significant side-lobe suppression and band widening through apodization.
    • Demonstrated complete, high-extinction 2x2 optical switching with a small effective index change (2 x 10^-3).

    Conclusions:

    • The optimized SCISSOR design enables unprecedented control over optical filter shapes.
    • The demonstrated switching performance is suitable for advanced optical communication systems.
    • These devices offer versatile applications including tunable filtering, sensing, reconfigurable add/drop multiplexing, and wavelength-division demultiplexing.