Measurement of erbium confinement in optical fibers: a differential mode-launching technique

Abstract

We present a selective mode-launching technique to determine the confinement of erbium in optical fibers. The loss per meter,α_lm of the individual LP_lm modes (LP₀₁ and LP₁₁ at 980 nm) is measured, and the ratio γ = α₀₁/α₁₁ is related to the concentration of erbium in the core. We assume a Gaussian diffusion profile for erbium and relate the dependence of γ on erbium confinement by using exact mode profiles. This technique uses only two sets of measurements and is independent of erbium concentration.

© 1992 Optical Society of America

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