title: Experimental study of the geometric group-delay dispersion in graded-index media.
abstract: We use the highly sensitive method of spatially coherent white-light interferometry to measure the geometric group-delay dispersion in graded-index media. Our measurements confirm previous analyses that the geometric dispersion produced by off-axis beam propagation is anomalous (negative), hence may be used to eliminate the ubiquitous positive dispersion in optical systems. Fabrication of large index-gradient waveguides optimal for dispersion compensation is discussed.
authors.forename: H Y
authors.initials: HY
authors.lastname: Lin
authors.forename: J
authors.initials: J
authors.lastname: Wang