Abstract

We demonstrate efficient all-optical modulation using Rb vapor confined to a hollow-core photonic bandgap fiber. The intensity of a signal field participating in the four-wave-mixing process is modulated using a weak switching field. We observe $3\mathrm{dB}$ of attenuation in the signal field with only 3600 photons of switching energy, corresponding to 23 photons per atomic cross section ${\lambda }^2/(2\pi )$. Modulation bandwidths as high as $300\mathrm{MHz}$ are observed.

© 2010 Optical Society of America

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