An accurate technique was implemented to measure spectral hole burning in rare-earth amplifiers at room temperature, showing that thulium-doped fiber amplifiers exhibit hole depths four times lower than those of <i>C</i> -band erbium-doped fiber amplifiers.
© 2002 Optical Society of America
Fabien Roy, Dominique Bayart, Céline Heerdt, André Le Sauze, and Pascal Baniel, "Spectral hole burning measurement thulium-doped fiber amplifiers," Opt. Lett. 27, 10-12 (2002)