A method for measuring the nonlinear refractive index of optical fibers with an error of less than 5% is demonstrated. The technique is based on measuring the nonlinear phase shift experienced by a dual-frequency beat signal, permitting a simple, highly sensitive, accurate, repeatable, and easily automated measurement procedure and sampling. Measurements of the nonlinear coefficient in standard telecommunication, dispersion-shifted, and a number of dispersion-compensated fibers are presented.
© 1996 Optical Society of America
Original Manuscript: July 5, 1996
Published: December 15, 1996
A. Boskovic, L. Gruner-Nielsen, O. A. Levring, S. V. Chernikov, and J. R. Taylor, "Direct continuous-wave measurement of n2 in various types of telecommunication fiber at 1.55 μm," Opt. Lett. 21, 1966-1968 (1996)