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An efficient broad-band mid-wave IR fiber optic light source: design and performance simulation.

A Barh1, S Ghosh, R K Varshney

  • 1Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016, India.

Optics Express
|April 24, 2013
PubMed
Summary

Researchers developed a broadband fiber light source using degenerate four-wave mixing (D-FWM) in nonlinear chalcogenide microstructured optical fibers. This innovative design achieves significant amplification in the mid-wave infrared spectrum.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nonlinear Optics

Background:

  • Mid-wave infrared (MWIR) light sources are crucial for various applications.
  • Generating broadband light in the MWIR often faces limitations in efficiency and spectral range.
  • Degenerate four-wave mixing (D-FWM) is a promising nonlinear optical process for light generation.

Purpose of the Study:

  • To design and demonstrate a novel fiber-based light source for the MWIR spectrum.
  • To exploit degenerate four-wave mixing (D-FWM) in a highly nonlinear chalcogenide microstructured optical fiber (MOF).
  • To achieve a broad bandwidth (BW) light source by precisely tailoring the fiber's dispersion profile.

Main Methods:

  • Utilizing a meter-long, highly nonlinear chalcogenide MOF with a tailored dispersion profile.

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  • Employing an Erbium (Er3+)-doped ZBLAN fiber laser emitting at 2.8 μm as the pump source (5 W average power).
  • Investigating the D-FWM process to generate broadband emission in the MWIR region.

    • Main Results:

    • Achieved a superior D-FWM bandwidth (BW) through precise tailoring of the fiber's dispersion profile.
    • Realized positive quartic dispersion at the pump wavelength, enhancing the FWM process.
    • Obtained an amplification factor as high as 25 dB in the 3 - 3.9 μm spectral range.
    • Demonstrated an average power conversion efficiency exceeding 32%.

    Conclusions:

    • The designed fiber-based light source effectively utilizes D-FWM in chalcogenide MOFs for broadband MWIR generation.
    • Precise control over the fiber's dispersion profile is key to achieving broad bandwidths and high efficiencies.
    • This technology offers a promising solution for efficient and powerful MWIR light generation.