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Updated: Jun 9, 2026

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Broadband terahertz fiber directional coupler.

Kristian Nielsen1, Henrik K Rasmussen, Peter Uhd Jepsen

  • 1Technical University of Denmark, DTU Fotonik, Department of Photonics Engineering, DK-2800 Kgs. Lyngby, Denmark. krini@fotonik.dtu.dk

Optics Letters
|September 3, 2010
PubMed
Summary

We designed a short broadband fiber directional coupler for terahertz (THz) radiation. This device uses microstructured dual-core photonic crystal fiber for efficient broadband coupling.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Terahertz (THz) radiation applications require efficient and broadband optical components.
  • Existing fiber directional couplers often lack sufficient bandwidth for THz applications.

Purpose of the Study:

  • To design and demonstrate a short broadband fiber directional coupler for THz radiation.
  • To achieve broadband coupling by mechanically downdoping photonic crystal fiber cores.

Main Methods:

  • Design of a dual-core photonic crystal fiber.
  • Microstructuring of the fiber cores to achieve mechanical downdoping.
  • Fabrication and characterization of the fiber directional coupler.

Main Results:

  • Demonstration of a 3 dB fiber directional coupler.

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  • Achieved a bandwidth of 0.6 THz centered at 1.4 THz.
  • Broadband coupling realized through mechanical downdoping via microstructuring.

    • Conclusions:

    • Mechanical downdoping by microstructuring offers a practical alternative to chemical downdoping for fabricating broadband THz fiber couplers.
    • The developed coupler is a promising component for terahertz systems requiring wide operational bandwidths.