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Related Experiment Videos

Long optically controlled delays in optical fibers.

Kwang Yong Song1, Miguel González Herráez, Luc Thévenaz

  • 1Nanophotonics and Metrology Laboratory, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. songky@kaist.ac.kr

Optics Letters
|August 12, 2005
PubMed
Summary

This study demonstrates optical fiber delay lines controlled by stimulated Brillouin scattering, achieving a 150 ns time delay for optical signal pulses. This method offers a large, controllable delay for optical communications and signal processing applications.

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Area of Science:

  • Optics and Photonics
  • Fiber Optics
  • Nonlinear Optics

Background:

  • Optical delay lines are crucial components in various photonic systems.
  • Controlling signal pulse delay in optical fibers is challenging.
  • Stimulated Brillouin scattering (SBS) offers a potential mechanism for optical control.

Purpose of the Study:

  • To demonstrate optically controlled delay lines in optical fibers.
  • To achieve a significant time delay for optical signal pulses.
  • To investigate the underlying physics of group-velocity control via SBS.

Main Methods:

  • Utilizing group-velocity control of signal pulses.
  • Employing stimulated Brillouin scattering (SBS) in optical fibers.
  • Cascading fiber segments with unidirectional optical attenuators.

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Main Results:

  • Achieved a continuous time delay of 150 ns.
  • The demonstrated delay is significantly larger than the 40 ns signal pulse width.
  • Observed substantial pulse broadening, consistent with linear theory predictions.

Conclusions:

  • Optically controlled delay lines based on SBS are feasible.
  • The cascaded fiber segment approach enables large, controllable time delays.
  • Pulse broadening is an inherent characteristic that requires consideration in system design.