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Dual-pump push-pull polarization control using stimulated Brillouin scattering.

Zohar Shmilovitch1, Nikolay Primerov, Avi Zadok

  • 1School of Electrical Engineering, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, Israel.

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|January 26, 2012
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Summary

This study introduces a dual-pump method to enhance polarization pulling in stimulated Brillouin scattering (SBS) amplification. This technique improves polarization control for probe signals by using orthogonal pumps, effectively managing pump depletion.

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Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Fiber Optics

Background:

  • Stimulated Brillouin scattering (SBS) amplification is crucial for optical signal processing.
  • Signal amplification in SBS is highly dependent on the polarization states of the pump and probe waves.
  • Polarization pulling, where the probe's polarization aligns with maximum gain, is limited by pump depletion.

Purpose of the Study:

  • To develop and demonstrate a novel method for enhanced polarization pulling in SBS.
  • To investigate the use of two orthogonal pumps to improve polarization control.
  • To mitigate the effects of pump depletion on polarization pulling efficiency.

Main Methods:

  • Proposed a dual-pump system with orthogonally polarized pump waves.
  • Analyzed the amplification and attenuation effects of each pump on orthogonal probe polarization components.
  • Investigated the push-pull effect created by simultaneous amplification and attenuation.

Main Results:

  • The dual-pump technique achieves enhanced polarization pulling.
  • In the undepleted regime, similar pulling is observed as with a single pump but with lower signal gain.
  • The dual-pump method effectively defers pump depletion onset for stronger input signals.

Conclusions:

  • The proposed dual-pump SBS system offers superior polarization pulling efficiency.
  • This method is particularly beneficial for handling stronger input signals by delaying pump depletion.
  • The technique provides a new avenue for precise polarization control in optical amplification systems.