Numerical Modeling of Pump Absorption in Coiled and Twisted Double-Clad Fibers

0460234 - ÚFE 2017 RIV US eng J - Článek v odborném periodiku
Koška, Pavel - Peterka, Pavel - Doya, V.
Numerical Modeling of Pump Absorption in Coiled and Twisted Double-Clad Fibers.
IEEE Journal of Selected Topics in Quantum Electronics. Roč. 22, č. 2 (2016), s. 4401508. ISSN 1077-260X. E-ISSN 1558-4542
Grant CEP: GA ČR GA14-35256S; GA MŠMT(CZ) LD15122
Institucionální podpora: RVO:67985882
Klíčová slova: double-clad optical fibers * beam propagation method * fiber amplifiers
Kód oboru RIV: JA - Elektronika a optoelektronika, elektrotechnika
Impakt faktor: 3.971, rok: 2016

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
Trvalý link: http://hdl.handle.net/11104/0260361