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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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All-fiber comb filter with tunable free spectral range.

Julien Magné1, Philippe Giaccari, Sophie LaRochelle

  • 1Centre d'Optique, Photonique et Laser, Université Laval, Quebec G1K 7P4, Canada.

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Summary

Researchers developed a novel fiber optic frequency comb filter with tunable free spectral range (FSR). This innovation allows precise FSR adjustment using a spectral Talbot-like effect in a specialized fiber Bragg grating.

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Area of Science:

  • Optics and Photonics
  • Fiber Optics
  • Spectroscopy

Background:

  • Frequency combs are crucial for precise measurements.
  • Tuning the free spectral range (FSR) of frequency comb filters is essential for various applications.
  • Existing methods for FSR tuning can be complex or limited.

Purpose of the Study:

  • To demonstrate a new class of all-fiber frequency comb filter.
  • To achieve unprecedented capabilities for tuning the comb's free spectral range (FSR).
  • To explore the use of a spectral Talbot-like effect for FSR control.

Main Methods:

  • Utilized a sampled chirped fiber Bragg grating.
  • Exploited a spectral Talbot-like effect for filter operation.
  • Applied a linear strain gradient to the grating to tune the FSR.

Main Results:

  • Demonstrated a novel all-fiber frequency comb filter.
  • Achieved tunable FSR from 51 GHz down to 3.9 GHz.
  • Showcased discrete FSR tuning by integer division of the nominal FSR.

Conclusions:

  • The developed filter offers a new method for precise FSR control in fiber optic frequency combs.
  • The spectral Talbot-like effect provides a versatile mechanism for tailoring FSR.
  • This technology has potential applications in spectroscopy, metrology, and optical communications.