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Characterization of small-core diameter Er-doped fibers from far-field radiation measurements and analysis

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Abstract

Erbium-doped fibers used in optical fiber amplifiers are designed to guide high intensity pump and signal light beams. They typically have approximately step-index profile shapes with large core-cladding index differences and small core diameters in the range of 2–4 μm. Such small diameter profiles are difficult to resolve with available fiber refractive-index profilers or vidicon cameras. This paper describes a simple technique for resolving small core diameters of step-index fibers by scaling transmission measurements of far-field radiation patterns so that they overlay previously calculated mode-field profiles.

© 1992 Optical Society of America

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