Abstract

Investigation of four-wave mixing 6.4-µm 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.

© 1997 Optical Society of America

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