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Compact silicon-on-insulator-based multimode interference coupler with bilevel taper structure.

Daoxin Dai1, Jian-Jun He, Sailing He

  • 1Centre for Optical and Electromagnetic Research, Sweden. dxdai@coer.zju.edu.cn

Applied Optics
|August 27, 2005
PubMed
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This study introduces a compact silicon-on-insulator multimode interference coupler using bilevel tapers. The novel design enhances self-imaging quality and reduces excess loss and nonuniformity for improved photonic device performance.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Multimode interference (MMI) couplers are essential components in photonic integrated circuits.
  • Existing MMI coupler designs face challenges in achieving both compactness and low loss.
  • Silicon-on-insulator (SOI) technology offers advantages for high-performance photonic devices.

Purpose of the Study:

  • To design and theoretically validate a novel compact SOI-based MMI coupler.
  • To improve the self-imaging quality and reduce optical losses in MMI couplers.
  • To introduce bilevel taper structures for enhanced performance and miniaturization.

Main Methods:

  • Design of a novel MMI coupler with bilevel taper structures on SOI substrate.
  • Deep and shallow etching techniques for MMI sections and input-output waveguides.

Related Experiment Videos

  • Theoretical prediction of performance improvements.
  • Three-dimensional beam propagation method (3D-BPM) for numerical simulation.

    • Main Results:

    • The proposed bilevel taper design theoretically improves self-imaging quality.
    • The design leads to a more compact MMI coupler structure.
    • Simulated results for a 1x4 MMI coupler show reduced excess loss (approx. 0.2 dB) and nonuniformity (approx. 0.0285).

    Conclusions:

    • The novel bilevel taper design offers a promising solution for compact and efficient SOI-based MMI couplers.
    • This design effectively minimizes excess loss and nonuniformity, crucial for optical circuit performance.
    • The validated design advances the development of integrated photonic devices.