Optical fibers with negative group-velocity dispersion in the visible.
Dispersion measurements have been performed in optical fibers having a photoinduced refractive-index grating in the core. The results show that negative group-velocity dispersion can be obtained in these fibers over a frequency region of 500 MHz for wavelengths shorter than 550 nm.
Kuo
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Osterberg
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Seaton
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Stegeman
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Hill
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