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Active reduction of fluctuations in fourth-order modulation instability.

K Hammani1, C Finot, R Habert

  • 1Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, Dijon, France.

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Controlling pulse fluctuations in optical fibers requires careful seeding. Using two seeds, not one, effectively reduces unwanted pulse-to-pulse variations in fourth-order modulation instability.

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Area of Science:

  • Nonlinear Optics
  • Photonics
  • Fiber Optics

Background:

  • Fourth-order modulation instability (MI) in photonic crystal fibers (PCFs) can lead to significant pulse fluctuations.
  • Understanding and controlling these fluctuations is crucial for applications relying on stable optical pulses.

Purpose of the Study:

  • To experimentally investigate the fluctuation properties of a scalar fourth-order MI process in a PCF.
  • To identify methods for reducing large, wavelength-dependent pulse-to-pulse fluctuations.
  • To validate a novel seeding strategy for mitigating these fluctuations.

Main Methods:

  • Experimental study of a scalar fourth-order MI process in a PCF pumped in the normal dispersion region.
  • Utilizing single and dual-seed configurations to stimulate the MI process.
  • Comparison of experimental results with numerical simulations.

Main Results:

  • Observed significant wavelength-dependent pulse-to-pulse fluctuations with a single seed.
  • Demonstrated that two seeds, detuned from the maximum gain frequency, effectively reduce these fluctuations.
  • Confirmed that stimulating the cascaded second-order MI process is key to fluctuation reduction.

Conclusions:

  • Single-seed stimulation is insufficient for controlling fourth-order MI fluctuations in PCFs.
  • A dual-seed approach, exciting both fourth-order and cascaded second-order MI, is necessary and effective.
  • This research provides a practical method for stabilizing optical pulses in nonlinear fiber systems.