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Optical microfiber coupler for broadband single-mode operation.

Yongmin Jung1, Gilberto Brambilla, David J Richardson

  • 1Optoelectronics Research Centre, University of Southampton, Southampton, UK. ymj@orc.soton.ac.uk

Optics Express
|April 1, 2009
PubMed
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We developed a broadband microfiber coupler (MFC) that efficiently splits optical power into the fundamental mode. This device suppresses unwanted higher-order modes, enabling single-mode operation across a wide spectrum.

Area of Science:

  • Optical Engineering
  • Photonics
  • Materials Science

Background:

  • Microfiber couplers (MFCs) are crucial for optical signal processing.
  • Existing MFCs can suffer from higher-order mode excitation, limiting performance.
  • Broadband, single-mode operation is highly desirable for advanced optical systems.

Purpose of the Study:

  • To design and demonstrate a broadband single-mode microfiber coupler (MFC).
  • To suppress higher-order modes (HOMs) effectively at the input fiber.
  • To achieve efficient power splitting into the fundamental mode at output ports.

Main Methods:

  • Fabrication of a bi-conical microfiber coupler with a specifically designed transition region.
  • Characterization of the MFC's performance over a broad spectral range.

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  • Utilizing conventional telecommunication optical fibers for fabrication.

    • Main Results:

    • Demonstrated broadband single-mode operation from 400 to 1700 nm.
    • Achieved efficient 3-dB power splitting.
    • MFC exhibited a very thin taper waist of approximately 1.5 micrometers.
    • Effective suppression of higher-order modes was confirmed.

    Conclusions:

    • The designed MFC effectively suppresses higher-order modes.
    • Broadband, single-mode power splitting is achievable with this MFC design.
    • This technology is suitable for applications requiring high-performance optical signal manipulation.