Abstract

A new exit-radiation pattern method for measuring the refractive-index profile of a single-mode fiber is proposed and used experimentally. In this method the profile is computed from the far-field exit-radiation pattern of the HE₁₁ mode at the end of the single-mode fiber. This method can be applied to a cabled fiber, and the propagation constant, field profile, and group delay of the HE₁₁ mode, and the single-mode limit can be obtained as well as the index profile. The principle, computer simulations, experimental setup, and experimental results are first described. The profile obtained shows a good agreement with that obtained from the interference fringe pattern measured before drawing the fiber. Computations of the group delay of the HE₁₁ mode and the single-mode limit from the measured exit-radiation pattern are discussed.

© 1979 Optical Society of America

Refractive-index profiling of single-mode optical fibers and performs

Herman M. Presby, Dietrich Marcuse, and William G. French
Appl. Opt. 18(23) 4006-4011 (1979)

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