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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 7 — Mar. 26, 2012
  • pp: 7263–7273

Optimizing single mode robustness of the distributed modal filtering rod fiber amplifier

Mette Marie Jørgensen, Sidsel Rübner Petersen, Marko Laurila, Jesper Lægsgaard, and Thomas Tanggaard Alkeskjold  »View Author Affiliations

Optics Express, Vol. 20, Issue 7, pp. 7263-7273 (2012)

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High-power fiber amplifiers for pulsed applications require large mode area (LMA) fibers having high pump absorption and near diffraction limited output. Photonic crystal fibers allow realization of short LMA fiber amplifiers having high pump absorption through a pump cladding that is decoupled from the outer fiber diameter. However, achieving ultra low NA for single mode (SM) guidance is challenging, thus different design strategies must be applied. The distributed modal filtering (DMF) design enables SM guidance in ultra low NA fibers with very large cores, where large preform tolerances can be compensated during the fiber draw. Design optimization of the SM bandwidth of the DMF rod fiber is presented. Analysis of band gap properties results in a fourfold increase of the SM bandwidth compared to previous results, achieved by utilizing the first band of cladding modes, which can cover a large fraction of the Yb emission band including wavelengths of 1030 nm and 1064 nm. Design parameters tolerating refractive index fabrication uncertainties of ± 10−4 are targeted to yield stable SM bandwidths.

© 2012 OSA

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.4005) Fiber optics and optical communications : Microstructured fibers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 18, 2012
Revised Manuscript: March 2, 2012
Manuscript Accepted: March 9, 2012
Published: March 14, 2012

Mette Marie Jørgensen, Sidsel Rübner Petersen, Marko Laurila, Jesper Lægsgaard, and Thomas Tanggaard Alkeskjold, "Optimizing single mode robustness of the distributed modal filtering rod fiber amplifier," Opt. Express 20, 7263-7273 (2012)

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