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Related Experiment Videos

Stratified waveguide grating coupler for normal fiber incidence.

Bin Wang1, Jianhua Jiang, Diana M Chambers

  • 1Nano and Micro Devices Center, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA.

Optics Letters
|May 4, 2005
PubMed
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We developed a new stratified waveguide grating coupler (SWGC) for efficient light coupling. This device achieves ~72% coupling efficiency from fiber to waveguide without extra optics.

Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics

Background:

  • Efficient light coupling between optical fibers and planar waveguides is crucial for integrated photonic circuits.
  • Traditional methods often require complex intermediate optics or suffer from low coupling efficiency.

Purpose of the Study:

  • To introduce a novel Stratified Waveguide Grating Coupler (SWGC) for direct fiber-to-waveguide light coupling.
  • To achieve high coupling efficiency in the strong coupling regime without additional optical components.

Main Methods:

  • Utilized two-dimensional finite-difference time-domain (2D FDTD) simulations.
  • Employed microgenetic algorithm optimization for device design.
  • Analyzed phase-matching and Bragg conditions.

Main Results:

Related Experiment Videos

  • Demonstrated a coupling efficiency of approximately 72% for fiber-to-slab waveguide coupling.
  • Achieved coupling between an 8.3-microm core fiber (delta=0.36%) and a 1.2-microm slab waveguide (delta=3.1%).
  • Confirmed simultaneous satisfaction of phase-matching and Bragg conditions via the fundamental leaky mode.

Conclusions:

  • The proposed SWGC offers a highly efficient solution for direct optical fiber to waveguide coupling.
  • The device operates effectively in the strong coupling regime, simplifying photonic integration.
  • The design validates the simultaneous fulfillment of critical phase-matching and Bragg conditions.