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Article Dans Une Revue IEEE Journal of Selected Topics in Quantum Electronics Année : 2015

Numerical modeling of pump absorption in coiled and twisted double-clad fibers

Résumé

We report the analysis of multimode pump absorption in double-clad rare-earth-doped fibers under realistic bending conditions. The finite-element beam-propagation method is used for the analysis. The fiber bending is approximated by the transformation of the refractive index profile of the fiber. Double-clad fibers of hexagonal, circular and stadium-like cross-sections are studied as examples. In addition, the double-clad waveguide structure of a two-fiber bundle is investigated. Simulations show that the bending effects cannot be neglected in double-clad fiber multimode pump propagation analysis and optimization. The reported rigorous numerical model opens new way to design double-clad fibers and to optimize the pump absorption efficiency. We show that high pump-absorption efficiency better than the ideal (ergodic) limit, can be achieved by simultaneous coiling and twisting of the double-clad fiber. Index Terms—double-clad optical fibers, optical pumping, fiber lasers, fiber amplifiers, finite element method, beam propagation method
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Dates et versions

hal-01304201 , version 1 (22-04-2016)

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Pavel Koska, Pavel Peterka, Valérie Doya. Numerical modeling of pump absorption in coiled and twisted double-clad fibers. IEEE Journal of Selected Topics in Quantum Electronics, 2015, 22 (2), pp.4401508. ⟨10.1109/JSTQE.2015.2490100⟩. ⟨hal-01304201⟩
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