C. Paré "Influence of inner cladding shape and stress-applying parts on the pump absorption of a double-clad fiber amplifier" Proc. of SPIE, 5260:272-278, 2003
Abstract: We report the results of a numerical analysis of the pump absorption in a double-clad fiber amplifier based on a beam-propagation method. Various inner-cladding shapes are compared in terms of absorption efficiency. This includes the circular shape with an offset core, the hexagonal and D-shaped fibers, a circular fiber with two truncations and a polarization-maintaining circular fiber.
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