Characterizing the modes of a core-pumped, large-mode area Er fiber using spatially and spectrally resolved imaging

Higher-order-modes of a 70-mum core-diameter, Er-doped-fiber are characterized over a broad wavelength range using a supercontinuum with spatially and spectrally resolved imaging. Pumping the Er-doped-fiber with 1480-nm in the fundamental mode decreases the higher-order-mode content.