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Optimum access waveguide width for 1 x N multimode interference couplers on silicon nanomembrane.

Amir Hosseini1, Harish Subbaraman, David Kwong

  • 1Microelectronic Research Center, Department of Electrical and Computer Engineering, University of Texas, 10100 Burnet Road, Austin, Texas 78758, USA. ahoss@mail.utexas.edu

Optics Letters
|September 3, 2010
PubMed
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We developed a formula to find the best width for multimode interference (MMI) coupler waveguides. This formula helps optimize performance for devices with many outputs, like 1x12 MMI couplers.

Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Waveguide Design

Background:

  • Multimode interference (MMI) couplers are essential components in integrated photonic circuits.
  • Optimizing MMI coupler performance, particularly for devices with a large number of outputs (1xN), is critical for signal distribution.
  • Existing design methods may lack analytical precision for determining optimal waveguide dimensions.

Purpose of the Study:

  • To derive an analytical formula for determining the optimum width of access waveguides in 1xN multimode interference (MMI) couplers.
  • To establish a reliable design rule for MMI couplers with a large number of outputs.

Main Methods:

  • Derivation of an analytical formula for optimum access waveguide width.
  • Eigenmode-decomposition-based simulations to validate the formula.

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  • Fabrication and experimental characterization of 1x12 MMI couplers on a silicon-on-insulator (SOI) nanomembrane substrate.

    • Main Results:

    • The derived analytical formula accurately predicts the optimum access waveguide width.
    • Simulations show the optimum width corresponds to diminishing returns in insertion loss and output uniformity.
    • Experimental results confirm the formula's reliability for designing 1x12 MMI couplers.

    Conclusions:

    • The analytical formula provides an effective design rule for optimizing 1xN MMI couplers.
    • The findings are applicable to MMI couplers with a large number of outputs.
    • This research advances the design and fabrication of efficient integrated photonic devices.