Journal
SCIENCE
Volume 312, Issue 5775, Pages 895-897Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1124524
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The nature of pulse propagation through a material with a negative value of the group velocity has been mysterious, as simple models seem to predict that pulses will propagate backward'' through such a material. Using an erbium-doped optical fiber and measuring the time evolution of the pulse intensity at many points within the fiber, we demonstrate that the peak of the pulse does propagate backward inside the fiber, even though the energy flow is always in the forward direction.
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