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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 25,
  • Issue 1,
  • pp. 201-206
  • (2007)

Broadband SBS Slow Light in an Optical Fiber

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Abstract

In this paper, we investigate slow light via stimulated Brillouin scattering (SBS) in a room temperature optical fiber that is pumped by a spectrally broadened laser. Broadening the spectrum of the pump field increases the linewidth Δω<sub>P</sub> of the Stokes amplifying resonance, thereby increasing the slow-light bandwidth. One physical bandwidth limitation occurs when the linewidth becomes several times larger than the Brillouin frequency shift Ω<sub>B</sub> so that the anti-Stokes absorbing resonance substantially cancels out the Stokes amplifying resonance and, hence, the slow-light effect. We find that partial overlap of the Stokes and anti-Stokes resonances can actually lead to an enhancement of the slow-light delay-bandwidth product when Δω<sub>P</sub> ~ or = 1.3 Ω<sub>B</sub>. Using this general approach, we increase the Brillouin slow-light bandwidth to over 12 GHz from its nominal linewidth of ~30 MHz obtained for monochromatic pumping. We controllably delay 75-ps-long pulses by up to 47 ps and study the data-pattern dependence of the broadband SBS slow-light system.

© 2007 IEEE

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