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10 February 2011 Spatial and spectral imaging of LMA photonic crystal fiber amplifiers
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We demonstrate modal characterization using spatial and spectral resolved (S2) imaging, on an Ytterbium-doped large-mode-area photonic crystal fiber (PCF) amplifier and compare results with conventional cut-off 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 40μm core double-clad PCF amplifier with various launching and coiling configurations. We demonstrate a HOM suppression of more than -24dB with variance of 2.3dB.
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Marko Laurila, Thomas T. Alkeskjold, Jesper Laegsgaard, and Jes Broeng "Spatial and spectral imaging of LMA photonic crystal fiber amplifiers", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142D (10 February 2011);

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