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Optical Engineering • Open Access

Modal analysis of a large-mode area photonic crystal fiber amplifier using spectral-resolved imaging
Author(s): Marko Laurila; Jesper Lægsgaard; Thomas Tanggaard Alkeskjold; Jes Broeng

Paper Abstract

We perform modal characterization on an ytterbium-doped large mode area photonic-crystal-fiber (PCF) amplifier using spatial and spectral (S2) resolved imaging and compare results to conventional cutoff methods. We apply numerical simulations and step-index fiber experiments to calibrate our mathematical and experimental routines of our S2 imaging system. We systematically analyze higher-order-mode (HOM) content of a polarizing 40-μm core double-clad PCF amplifier with various launching and coiling configurations. We demonstrate a HOM suppression of more than −24 dB with variance of 2.3 dB.

Paper Details

Date Published: 1 November 2011
PDF: 7 pages
Opt. Eng. 50(11) 111604 doi: 10.1117/1.3609816
Published in: Optical Engineering Volume 50, Issue 11
Show Author Affiliations
Marko Laurila, Technical Univ. of Denmark (Denmark)
Jesper Lægsgaard, Technical Univ. of Denmark (Denmark)
Thomas Tanggaard Alkeskjold, NKT Photonics A/S (Denmark)
Jes Broeng, NKT Photonics A/S (Denmark)

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