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Related Experiment Video

Updated: Jul 2, 2026

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Enhancing alignment tolerance of silicon waveguide by using a wide grating coupler.

Jong-Moo Lee1, Kap-Joong Kim, Gyungock Kim

  • 1Electronics and Telecommunications Research Institute, 161 Gajong-dong, Yusong-gu, Daejeon 305-350, Korea. jongmool@etri.re.kr

Optics Express
|August 20, 2008
PubMed
Summary

We developed a wider grating coupler for improved fiber alignment. This new design significantly enhances positional tolerance, reducing coupling loss and simplifying optical system assembly.

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Area of Science:

  • Optoelectronics
  • Nanofabrication
  • Fiber Optics

Background:

  • Grating couplers are essential for fiber-to-chip optical interconnects.
  • Precise alignment is critical for minimizing coupling loss in optical systems.
  • Standard grating couplers often require stringent alignment tolerances.

Purpose of the Study:

  • To fabricate and characterize a wider grating coupler for enhanced alignment tolerance.
  • To improve the performance of single-mode fiber to grating coupler interfaces.
  • To investigate the impact of grating coupler width on positional accuracy.

Main Methods:

  • Fabrication of a 20 um wide grating coupler.
  • Coupling experiments with a single-mode thermally-expanded-core (TEC) fiber.

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Last Updated: Jul 2, 2026

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Published on: February 3, 2023

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  • Measurement of coupling loss, optical bandwidth, and alignment tolerances.
  • Comparison with a standard 10 um wide grating coupler.

    • Main Results:

    • Minimal coupling loss of 5 dB per facet achieved.
    • Optical 3 dB bandwidth measured at 40 nm.
    • Enhanced alignment tolerances: ±7.5 µm (horizontal) and +290 µm (vertical) at 3 dB.
    • Alignment tolerances improved 2x (horizontal) and 4x (vertical) compared to standard couplers.

    Conclusions:

    • The 20 um wide grating coupler significantly enhances alignment tolerance for TEC fibers.
    • Wider grating couplers offer a practical solution for relaxed alignment in optical systems.
    • This advancement facilitates easier and more robust fiber optic connections.