title: Four-wave mixing in non-step-index optical fibers: a sensitive technique for measurement of refractive-index profiles.
abstract: Investigation of four-wave mixing 6.4-mum core-diameter fiber with 520-610-nm pump light is used to develop a new technique for characterizing the refractive-index profiles of non-step-index fibers. Deviation from the step-index profile is measured. Small variations in the refractive index between different segments of the same commercial fiber is measured with a sensitivity of 0.0001.
authors.forename: A
authors.initials: A
authors.lastname: Sharma
authors.forename: R
authors.initials: R
authors.lastname: Posey
authors.forename: L
authors.initials: L
authors.lastname: Phillips
authors.forename: T
authors.initials: T
authors.lastname: George
authors.forename: P
authors.initials: P
authors.lastname: Ruffin