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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 26834–26842

The influence of index-depressions in core-pumped Yb-doped large pitch fibers

Florian Jansen, Fabian Stutzki, Hans-Jürgen Otto, Martin Baumgartl, Cesar Jauregui, Jens Limpert, and Andreas Tünnermann  »View Author Affiliations

Optics Express, Vol. 18, Issue 26, pp. 26834-26842 (2010)

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Rare-earth doped photonic crystal fibers rely ideally on an index matching of the doped core to the surrounding glass to work properly. Obtaining a perfect index matching is technologically very challenging, and fiber manufacturers opt for targeting an index depression instead, which still ensures the influence of the photonic structure on the light propagation. In this paper the analysis of the influence of this core index depression on the higher-order mode discrimination and on the beam quality of the fundamental mode of different designs of core-pumped active large pitch photonic crystal fibers is discussed. The most promising design is evaluated in terms of mode area scaling with a view to mode field diameters above 100µm. Detailed requirements on the accuracy of the core index matching are deduced.

© 2010 OSA

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.5295) Fiber optics and optical communications : Photonic crystal fibers
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: September 17, 2010
Revised Manuscript: October 21, 2010
Manuscript Accepted: October 27, 2010
Published: December 7, 2010

Florian Jansen, Fabian Stutzki, Hans-Jürgen Otto, Martin Baumgartl, Cesar Jauregui, Jens Limpert, and Andreas Tünnermann, "The influence of index-depressions in core-pumped Yb-doped large pitch fibers," Opt. Express 18, 26834-26842 (2010)

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