Competition between the Modulation Instability and Stimulated Brillouin Scattering in a Broadband Slow Light Device

Details Competition between the Modulation Instability and Stimulated Brillouin Scattering in a Broadband Slow Light Device Competition between the Modulation Instability and Stimulated Brillouin Scattering in a Broadband Slow Light Device

2010-04-20

arxiv.org/abs/1006.5380v1

Physics

Optics

Scientific paper

We observe competition between the modulation instability (MI) and stimulated Brillouin scattering (SBS) in a 9.2-GHz broadband SBS slow light device, in which a standard 20-km-long single-mode LEAF fibre is used as the SBS medium. We find that MI is dominant and depletes most of the pump power when we use an intense pump beam at ~1.55 {\mu}m, where the LEAF fibre is anomalously dispersive. The dominance of the MI in the LEAF-fibre-based system suppresses the SBS gain, degrading the SBS slow light delay and limiting the SBS gain-bandwidth to 126 dB \cdot GHz. In a dispersion-shifted highly nonlinear fibre, the SBS slow light delay is improved due to the suppression of the MI, resulting in a gain-bandwidth product of 344 dB \cdot GHz, limited by our available pump power of 0.82 W.

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