Efficiency of pump absorption in double-clad fiber amplifiers. II. Broken circular symmetry

Abstract

Absorption of an incoherent pump in a double-clad fiber amplifier is analyzed in the paraxial wave approximation. Different inner cladding shapes are considered. A small spiral distortion of an otherwise circular inner cladding shape is shown to enhance the coupling efficiency significantly relative to other geometries.

© 2002 Optical Society of America

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